Subzero: Fix the g++ build (e.g. Windows).

src/IceGlobalContext.cpp

 //===- subzero/src/IceGlobalContext.cpp - Global context defs -------------===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines aspects of the compilation that persist across
 // multiple functions.
 //
 //===----------------------------------------------------------------------===//
 
 #include <ctype.h> // isdigit(), isupper()
 #include <locale>  // locale
 #include <unordered_map>
 
 #include "IceCfg.h"
 #include "IceClFlags.h"
 #include "IceDefs.h"
 #include "IceGlobalContext.h"
 #include "IceGlobalInits.h"
 #include "IceOperand.h"
 #include "IceTargetLowering.h"
 #include "IceTimerTree.h"
 #include "IceTypes.h"
 
-template <> struct std::hash<Ice::RelocatableTuple> {
-  std::size_t operator()(const Ice::RelocatableTuple &Key) const {
-    return std::hash<Ice::IceString>()(Key.Name) +
-           std::hash<Ice::RelocOffsetT>()(Key.Offset);
+namespace std {
+template <> struct hash<Ice::RelocatableTuple> {
+  size_t operator()(const Ice::RelocatableTuple &Key) const {
+    return hash<Ice::IceString>()(Key.Name) +
+           hash<Ice::RelocOffsetT>()(Key.Offset);
   }
 };
+} // end of namespace std
 
 namespace Ice {
 
 // TypePool maps constants of type KeyType (e.g. float) to pointers to
 // type ValueType (e.g. ConstantFloat).
 template <Type Ty, typename KeyType, typename ValueType> class TypePool {
   TypePool(const TypePool &) = delete;
   TypePool &operator=(const TypePool &) = delete;
 
 public:
@@ skipping 438 matching lines @@
 }
 
 TimerMarker::TimerMarker(TimerIdT ID, const Cfg *Func)
     : ID(ID), Ctx(Func->getContext()),
       Active(Func->getFocusedTiming() || Ctx->getFlags().SubzeroTimingEnabled) {
   if (Active)
     Ctx->pushTimer(ID);
 }
 
 } // end of namespace Ice