Move global V8::UseCrankshaft() into the Isolate.

src/compiler.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 317 matching lines @@
   enum Mode {
     BASE,
     OPTIMIZE,
     NONOPT,
     STUB
   };
 
   void Initialize(Isolate* isolate, Mode mode, Zone* zone);
 
   void SetMode(Mode mode) {
-    ASSERT(V8::UseCrankshaft());
+    ASSERT(isolate()->use_crankshaft());
     mode_ = mode;
   }
 
   // Flags using template class BitField<type, start, length>.  All are
   // false by default.
   //
   // Compilation is either eager or lazy.
   class IsLazy:   public BitField<bool, 0, 1> {};
   // Flags that can be set for eager compilation.
   class IsEval:   public BitField<bool, 1, 1> {};
@@ skipping 296 matching lines @@
   unsigned info_zone_start_allocation_size_;
   ElapsedTimer timer_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_