Add support for mangling guard variables.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@68969 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/Mangle.h b/lib/CodeGen/Mangle.h
index 627c16a..b3f88b0 100644
--- a/lib/CodeGen/Mangle.h
+++ b/lib/CodeGen/Mangle.h
@@ -25,9 +25,12 @@
 namespace clang {
   class ASTContext;
   class NamedDecl;
-
+  class VarDecl;
+  
   bool mangleName(const NamedDecl *D, ASTContext &Context, 
                   llvm::raw_ostream &os);
+  void mangleGuardVariable(const VarDecl *D, ASTContext &Context,
+                           llvm::raw_ostream &os);
 }
 
 #endif