Do not mangle in MS-way the globals with magic \001 in the name.
Based on the patch by David Nadlinger!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@179889 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Mangler.cpp b/lib/Target/Mangler.cpp
index edfd421..d31efa8 100644
--- a/lib/Target/Mangler.cpp
+++ b/lib/Target/Mangler.cpp
@@ -188,7 +188,12 @@
   
   // If this global has a name, handle it simply.
   if (GV->hasName()) {
-    getNameWithPrefix(OutName, GV->getName(), PrefixTy);
+    StringRef Name = GV->getName();
+    getNameWithPrefix(OutName, Name, PrefixTy);
+    // No need to do anything else if the global has the special "do not mangle"
+    // flag in the name.
+    if (Name[0] == 1)
+      return;
   } else {
     // Get the ID for the global, assigning a new one if we haven't got one
     // already.