diff --git a/linux-x64/clang/include/llvm/AsmParser/Parser.h b/linux-x64/clang/include/llvm/AsmParser/Parser.h
index b0c6034..e1c7f74 100644
--- a/linux-x64/clang/include/llvm/AsmParser/Parser.h
+++ b/linux-x64/clang/include/llvm/AsmParser/Parser.h
@@ -13,18 +13,24 @@
 #ifndef LLVM_ASMPARSER_PARSER_H
 #define LLVM_ASMPARSER_PARSER_H
 
-#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringRef.h"
+#include <memory>
 
 namespace llvm {
 
 class Constant;
 class LLVMContext;
+class MemoryBufferRef;
 class Module;
 class ModuleSummaryIndex;
 struct SlotMapping;
 class SMDiagnostic;
 class Type;
 
+typedef llvm::function_ref<Optional<std::string>(StringRef)>
+    DataLayoutCallbackTy;
+
 /// This function is a main interface to the LLVM Assembly Parser. It parses
 /// an ASCII file that (presumably) contains LLVM Assembly code. It returns a
 /// Module (intermediate representation) with the corresponding features. Note
@@ -36,14 +42,9 @@
 /// \param Context Context in which to allocate globals info.
 /// \param Slots The optional slot mapping that will be initialized during
 ///              parsing.
-/// \param UpgradeDebugInfo Run UpgradeDebugInfo, which runs the Verifier.
-///                         This option should only be set to false by llvm-as
-///                         for use inside the LLVM testuite!
-/// \param DataLayoutString Override datalayout in the llvm assembly.
-std::unique_ptr<Module>
-parseAssemblyFile(StringRef Filename, SMDiagnostic &Err, LLVMContext &Context,
-                  SlotMapping *Slots = nullptr, bool UpgradeDebugInfo = true,
-                  StringRef DataLayoutString = "");
+std::unique_ptr<Module> parseAssemblyFile(StringRef Filename, SMDiagnostic &Err,
+                                          LLVMContext &Context,
+                                          SlotMapping *Slots = nullptr);
 
 /// The function is a secondary interface to the LLVM Assembly Parser. It parses
 /// an ASCII string that (presumably) contains LLVM Assembly code. It returns a
@@ -56,16 +57,10 @@
 /// \param Context Context in which to allocate globals info.
 /// \param Slots The optional slot mapping that will be initialized during
 ///              parsing.
-/// \param UpgradeDebugInfo Run UpgradeDebugInfo, which runs the Verifier.
-///                         This option should only be set to false by llvm-as
-///                         for use inside the LLVM testuite!
-/// \param DataLayoutString Override datalayout in the llvm assembly.
 std::unique_ptr<Module> parseAssemblyString(StringRef AsmString,
                                             SMDiagnostic &Err,
                                             LLVMContext &Context,
-                                            SlotMapping *Slots = nullptr,
-                                            bool UpgradeDebugInfo = true,
-                                            StringRef DataLayoutString = "");
+                                            SlotMapping *Slots = nullptr);
 
 /// Holds the Module and ModuleSummaryIndex returned by the interfaces
 /// that parse both.
@@ -86,15 +81,16 @@
 /// \param Context Context in which to allocate globals info.
 /// \param Slots The optional slot mapping that will be initialized during
 ///              parsing.
-/// \param UpgradeDebugInfo Run UpgradeDebugInfo, which runs the Verifier.
-///                         This option should only be set to false by llvm-as
-///                         for use inside the LLVM testuite!
-/// \param DataLayoutString Override datalayout in the llvm assembly.
-ParsedModuleAndIndex
-parseAssemblyFileWithIndex(StringRef Filename, SMDiagnostic &Err,
-                           LLVMContext &Context, SlotMapping *Slots = nullptr,
-                           bool UpgradeDebugInfo = true,
-                           StringRef DataLayoutString = "");
+/// \param DataLayoutCallback Override datalayout in the llvm assembly.
+ParsedModuleAndIndex parseAssemblyFileWithIndex(
+    StringRef Filename, SMDiagnostic &Err, LLVMContext &Context,
+    SlotMapping *Slots = nullptr,
+    DataLayoutCallbackTy DataLayoutCallback = [](StringRef) { return None; });
+
+/// Only for use in llvm-as for testing; this does not produce a valid module.
+ParsedModuleAndIndex parseAssemblyFileWithIndexNoUpgradeDebugInfo(
+    StringRef Filename, SMDiagnostic &Err, LLVMContext &Context,
+    SlotMapping *Slots, DataLayoutCallbackTy DataLayoutCallback);
 
 /// This function is a main interface to the LLVM Assembly Parser. It parses
 /// an ASCII file that (presumably) contains LLVM Assembly code for a module
@@ -113,15 +109,11 @@
 /// \param Err Error result info.
 /// \param Slots The optional slot mapping that will be initialized during
 ///              parsing.
-/// \param UpgradeDebugInfo Run UpgradeDebugInfo, which runs the Verifier.
-///                         This option should only be set to false by llvm-as
-///                         for use inside the LLVM testuite!
-/// \param DataLayoutString Override datalayout in the llvm assembly.
-std::unique_ptr<Module> parseAssembly(MemoryBufferRef F, SMDiagnostic &Err,
-                                      LLVMContext &Context,
-                                      SlotMapping *Slots = nullptr,
-                                      bool UpgradeDebugInfo = true,
-                                      StringRef DataLayoutString = "");
+/// \param DataLayoutCallback Override datalayout in the llvm assembly.
+std::unique_ptr<Module> parseAssembly(
+    MemoryBufferRef F, SMDiagnostic &Err, LLVMContext &Context,
+    SlotMapping *Slots = nullptr,
+    DataLayoutCallbackTy DataLayoutCallback = [](StringRef) { return None; });
 
 /// Parse LLVM Assembly including the summary index from a MemoryBuffer.
 ///
@@ -129,18 +121,12 @@
 /// \param Err Error result info.
 /// \param Slots The optional slot mapping that will be initialized during
 ///              parsing.
-/// \param UpgradeDebugInfo Run UpgradeDebugInfo, which runs the Verifier.
-///                         This option should only be set to false by llvm-as
-///                         for use inside the LLVM testuite!
-/// \param DataLayoutString Override datalayout in the llvm assembly.
 ///
 /// parseAssemblyFileWithIndex is a wrapper around this function.
 ParsedModuleAndIndex parseAssemblyWithIndex(MemoryBufferRef F,
                                             SMDiagnostic &Err,
                                             LLVMContext &Context,
-                                            SlotMapping *Slots = nullptr,
-                                            bool UpgradeDebugInfo = true,
-                                            StringRef DataLayoutString = "");
+                                            SlotMapping *Slots = nullptr);
 
 /// Parse LLVM Assembly for summary index from a MemoryBuffer.
 ///
@@ -163,14 +149,11 @@
 /// \param Slots The optional slot mapping that will be initialized during
 ///              parsing.
 /// \return true on error.
-/// \param UpgradeDebugInfo Run UpgradeDebugInfo, which runs the Verifier.
-///                         This option should only be set to false by llvm-as
-///                         for use inside the LLVM testuite!
-/// \param DataLayoutString Override datalayout in the llvm assembly.
-bool parseAssemblyInto(MemoryBufferRef F, Module *M, ModuleSummaryIndex *Index,
-                       SMDiagnostic &Err, SlotMapping *Slots = nullptr,
-                       bool UpgradeDebugInfo = true,
-                       StringRef DataLayoutString = "");
+/// \param DataLayoutCallback Override datalayout in the llvm assembly.
+bool parseAssemblyInto(
+    MemoryBufferRef F, Module *M, ModuleSummaryIndex *Index, SMDiagnostic &Err,
+    SlotMapping *Slots = nullptr,
+    DataLayoutCallbackTy DataLayoutCallback = [](StringRef) { return None; });
 
 /// Parse a type and a constant value in the given string.
 ///