Import prebuilt clang toolchain for linux.
diff --git a/linux-x64/clang/include/llvm/CodeGen/RegAllocRegistry.h b/linux-x64/clang/include/llvm/CodeGen/RegAllocRegistry.h
new file mode 100644
index 0000000..481747d
--- /dev/null
+++ b/linux-x64/clang/include/llvm/CodeGen/RegAllocRegistry.h
@@ -0,0 +1,66 @@
+//===- llvm/CodeGen/RegAllocRegistry.h --------------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the implementation for register allocator function
+// pass registry (RegisterRegAlloc).
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CODEGEN_REGALLOCREGISTRY_H
+#define LLVM_CODEGEN_REGALLOCREGISTRY_H
+
+#include "llvm/CodeGen/MachinePassRegistry.h"
+
+namespace llvm {
+
+class FunctionPass;
+
+//===----------------------------------------------------------------------===//
+///
+/// RegisterRegAlloc class - Track the registration of register allocators.
+///
+//===----------------------------------------------------------------------===//
+class RegisterRegAlloc : public MachinePassRegistryNode {
+public:
+  using FunctionPassCtor = FunctionPass *(*)();
+
+  static MachinePassRegistry Registry;
+
+  RegisterRegAlloc(const char *N, const char *D, FunctionPassCtor C)
+      : MachinePassRegistryNode(N, D, (MachinePassCtor)C) {
+    Registry.Add(this);
+  }
+
+  ~RegisterRegAlloc() { Registry.Remove(this); }
+
+  // Accessors.
+  RegisterRegAlloc *getNext() const {
+    return (RegisterRegAlloc *)MachinePassRegistryNode::getNext();
+  }
+
+  static RegisterRegAlloc *getList() {
+    return (RegisterRegAlloc *)Registry.getList();
+  }
+
+  static FunctionPassCtor getDefault() {
+    return (FunctionPassCtor)Registry.getDefault();
+  }
+
+  static void setDefault(FunctionPassCtor C) {
+    Registry.setDefault((MachinePassCtor)C);
+  }
+
+  static void setListener(MachinePassRegistryListener *L) {
+    Registry.setListener(L);
+  }
+};
+
+} // end namespace llvm
+
+#endif // LLVM_CODEGEN_REGALLOCREGISTRY_H