bulk replace v8::Isolate::GetCurrent in tests

test/cctest/test-assembler-x64.cc

 // Copyright 2009 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 467 matching lines @@
 
   F0 f = FUNCTION_CAST<F0>(code->entry());
   int res = f();
   args.GetReturnValue().Set(v8::Integer::New(res));
 }
 
 
 TEST(StackAlignmentForSSE2) {
   CHECK_EQ(0, OS::ActivationFrameAlignment() % 16);
 
-  v8::Isolate* isolate = v8::Isolate::GetCurrent();
+  v8::Isolate* isolate = CcTest::isolate();
   v8::HandleScope handle_scope(isolate);
   v8::Handle<v8::ObjectTemplate> global_template = v8::ObjectTemplate::New();
   global_template->Set(v8_str("do_sse2"), v8::FunctionTemplate::New(DoSSE2));
 
   LocalContext env(NULL, global_template);
   CompileRun(
       "function foo(vec) {"
       "  return do_sse2(vec);"
       "}");
 
@@ skipping 12 matching lines @@
 
   // The mask should be 0b1000.
   CHECK_EQ(8, result->Int32Value());
 }
 
 #undef ELEMENT_COUNT
 #endif  // __GNUC__
 
 
 #undef __