Drop the LLVM mangler escape when printing the IR name in assembly comments

I'm tired of seeing this:
        .globl  "?Test@@YAXXZ"          # -- Begin function ^A?Test@@YAXXZ

llvm-svn: 306855
diff --git a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
index c48fcaa..ff427c9 100644
--- a/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
+++ b/llvm/lib/CodeGen/AsmPrinter/AsmPrinter.cpp
@@ -631,7 +631,9 @@
   const Function *F = MF->getFunction();
 
   if (isVerbose())
-    OutStreamer->GetCommentOS() << "-- Begin function " << F->getName() << '\n';
+    OutStreamer->GetCommentOS()
+        << "-- Begin function "
+        << GlobalValue::dropLLVMManglingEscape(F->getName()) << '\n';
 
   // Print out constants referenced by the function
   EmitConstantPool();