Index: include/llvm/LTO/LTO.h
===================================================================
--- include/llvm/LTO/LTO.h
+++ include/llvm/LTO/LTO.h
@@ -145,6 +145,17 @@
       skip();
     }
 
+    /// For symbols that are aliases for other symbols (for example,
+    /// COFF weak externals), returns the name of the symbol the alias
+    /// to. For other symbols, returns the empty string.
+    StringRef getAliasName() const {
+      auto *A = dyn_cast<GlobalAlias>(I->dyn_cast<GlobalValue*>());
+      if (A)
+	return A->getAliasee()->getName();
+      else
+	return "";
+    }
+
     /// Returns the mangled name of the global.
     StringRef getName() const { return Name; }