Index: include/llvm/IR/GlobalValue.h
===================================================================
--- include/llvm/IR/GlobalValue.h
+++ include/llvm/IR/GlobalValue.h
@@ -316,10 +316,18 @@
                                          GlobalValue::LinkageTypes Linkage,
                                          StringRef FileName);
 
+  /// Return the modified name for this global value suitable to be
+  /// used as the key for a global lookup (e.g. profile or ThinLTO).
+  std::string getGlobalIdentifier();
+
   /// Return a 64-bit global unique ID constructed from global value name
-  /// (i.e. returned by getGlobalIdentifier).
+  /// (i.e. returned by getGlobalIdentifier()).
   static uint64_t getGUID(StringRef GlobalName) { return MD5Hash(GlobalName); }
 
+  /// Return a 64-bit global unique ID constructed from global value name
+  /// (i.e. returned by getGlobalIdentifier()).
+  uint64_t getGUID() { return getGUID(getGlobalIdentifier()); }
+
   /// @name Materialization
   /// Materialization is used to construct functions only as they're needed.
   /// This
Index: lib/IR/Globals.cpp
===================================================================
--- lib/IR/Globals.cpp
+++ lib/IR/Globals.cpp
@@ -123,6 +123,11 @@
   return NewName;
 }
 
+std::string GlobalValue::getGlobalIdentifier() {
+  return getGlobalIdentifier(getName(), getLinkage(),
+                             getParent()->getSourceFileName());
+}
+
 const char *GlobalValue::getSection() const {
   if (auto *GA = dyn_cast<GlobalAlias>(this)) {
     // In general we cannot compute this at the IR level, but we try.