Subzero: Fix symbol name mangling. Make flags global.

src/IceCfg.h

Index: src/IceCfg.h
diff --git a/src/IceCfg.h b/src/IceCfg.h
index 8cfe4748558a7e3c67cc1c5047d57f40cf574dfd..e48071dfa2e3d9f071744a4d7799a76e9fffadeb 100644
--- a/src/IceCfg.h
+++ b/src/IceCfg.h
@@ -75,7 +75,7 @@ public:
   /// to translate and let a fallback translator handle the function.
   void setError(const IceString &Message);
   bool hasError() const { return HasError; }
-  IceString getError() const { return ErrorMessage; }
+  const IceString &getError() const { return ErrorMessage; }

[John, 2016/03/06 22:39:38]

I understand this change, but consider this carefully. String references might
bite you are careless - especially with auto

[Jim Stichnoth, 2016/03/07 00:03:10]

You're right, no sense doing risks to optimize getting an error message.  
Reverted.

   /// @}
 
   /// \name Manage nodes (a.k.a. basic blocks, CfgNodes).
@@ -225,7 +225,7 @@ public:
 
   void emit();
   void emitIAS();
-  static void emitTextHeader(const IceString &MangledName, GlobalContext *Ctx,
+  static void emitTextHeader(const IceString &Name, GlobalContext *Ctx,
                              const Assembler *Asm);
   void dump(const IceString &Message = "");