Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/Target/CodeGenCWrappers.h b/linux-x64/clang/include/llvm/Target/CodeGenCWrappers.h
new file mode 100644
index 0000000..e9a9905
--- /dev/null
+++ b/linux-x64/clang/include/llvm/Target/CodeGenCWrappers.h
@@ -0,0 +1,61 @@
+//===- llvm/Target/CodeGenCWrappers.h - CodeGen C Wrappers ------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file defines C bindings wrappers for enums in llvm/Support/CodeGen.h
+// that need them.  The wrappers are separated to avoid adding an indirect
+// dependency on llvm/Config/Targets.def to CodeGen.h.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_TARGET_CODEGENCWRAPPERS_H
+#define LLVM_TARGET_CODEGENCWRAPPERS_H
+
+#include "llvm-c/TargetMachine.h"
+#include "llvm/ADT/Optional.h"
+#include "llvm/Support/CodeGen.h"
+#include "llvm/Support/ErrorHandling.h"
+
+namespace llvm {
+
+inline Optional<CodeModel::Model> unwrap(LLVMCodeModel Model, bool &JIT) {
+  JIT = false;
+  switch (Model) {
+  case LLVMCodeModelJITDefault:
+    JIT = true;
+    LLVM_FALLTHROUGH;
+  case LLVMCodeModelDefault:
+    return None;
+  case LLVMCodeModelSmall:
+    return CodeModel::Small;
+  case LLVMCodeModelKernel:
+    return CodeModel::Kernel;
+  case LLVMCodeModelMedium:
+    return CodeModel::Medium;
+  case LLVMCodeModelLarge:
+    return CodeModel::Large;
+  }
+  return CodeModel::Small;
+}
+
+inline LLVMCodeModel wrap(CodeModel::Model Model) {
+  switch (Model) {
+  case CodeModel::Small:
+    return LLVMCodeModelSmall;
+  case CodeModel::Kernel:
+    return LLVMCodeModelKernel;
+  case CodeModel::Medium:
+    return LLVMCodeModelMedium;
+  case CodeModel::Large:
+    return LLVMCodeModelLarge;
+  }
+  llvm_unreachable("Bad CodeModel!");
+}
+} // namespace llvm
+
+#endif