[MS] Don't escape MS C++ names with \01

It is not needed after LLVM r327734. Now it will be easier to copy-paste
IR symbol names from Clang.

llvm-svn: 327738
diff --git a/clang/test/CodeGenCXX/pr30731.cpp b/clang/test/CodeGenCXX/pr30731.cpp
index f985c26..36da43f 100644
--- a/clang/test/CodeGenCXX/pr30731.cpp
+++ b/clang/test/CodeGenCXX/pr30731.cpp
@@ -16,6 +16,6 @@
 
 void f(S* s) { s->f(); }
 
-// CHECK-LABEL: define dso_local void @"\01?f@@YAXPAUS@@@Z"
+// CHECK-LABEL: define dso_local void @"?f@@YAXPAUS@@@Z"
 // CHECK: call
 // CHECK: ret void