Unify the way cctest initalizes the VM for each test case.

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 70 matching lines @@
 static const v8::internal::Register arg1 = rcx;
 static const v8::internal::Register arg2 = rdx;
 #else
 static const v8::internal::Register arg1 = rdi;
 static const v8::internal::Register arg2 = rsi;
 #endif
 
 #define __ assm.
 
 
-static v8::Persistent<v8::Context> env;
-
-
-static void InitializeVM() {
-  if (env.IsEmpty()) {
-    env = v8::Context::New();
-  }
-}
-
-
 TEST(AssemblerX64ReturnOperation) {
   OS::SetUp();
   // Allocate an executable page of memory.
   size_t actual_size;
   byte* buffer = static_cast<byte*>(OS::Allocate(Assembler::kMinimalBufferSize,
                                                  &actual_size,
                                                  true));
   CHECK(buffer);
   Assembler assm(Isolate::Current(), buffer, static_cast<int>(actual_size));
 
@@ skipping 243 matching lines @@
     CHECK(Operand(rsp, rbp, times_1, offset).AddressUsesRegister(rbp));
     CHECK(!Operand(rsp, rbp, times_1, offset).AddressUsesRegister(rax));
     CHECK(!Operand(rsp, rbp, times_1, offset).AddressUsesRegister(r15));
     CHECK(!Operand(rsp, rbp, times_1, offset).AddressUsesRegister(r13));
   }
 }
 
 
 TEST(AssemblerX64LabelChaining) {
   // Test chaining of label usages within instructions (issue 1644).
-  InitializeVM();
-  v8::HandleScope scope(env->GetIsolate());
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
   Assembler assm(Isolate::Current(), NULL, 0);
 
   Label target;
   __ j(equal, &target);
   __ j(not_equal, &target);
   __ bind(&target);
   __ nop();
 }
 
 
 TEST(AssemblerMultiByteNop) {
-  InitializeVM();
-  v8::HandleScope scope(env->GetIsolate());
+  CcTest::InitializeVM();
+  v8::HandleScope scope(CcTest::isolate());
   v8::internal::byte buffer[1024];
   Isolate* isolate = Isolate::Current();
   Assembler assm(isolate, buffer, sizeof(buffer));
   __ push(rbx);
   __ push(rcx);
   __ push(rdx);
   __ push(rdi);
   __ push(rsi);
   __ movq(rax, Immediate(1));
   __ movq(rbx, Immediate(2));
@@ skipping 46 matching lines @@
 
   F0 f = FUNCTION_CAST<F0>(code->entry());
   int res = f();
   CHECK_EQ(42, res);
 }
 
 
 
 
 #undef __