Made Isolate a mandatory parameter for everything Handle-related.

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 358 matching lines @@
   __ j(not_equal, &target);
   __ bind(&target);
   __ nop();
 }
 
 
 TEST(AssemblerMultiByteNop) {
   InitializeVM();
   v8::HandleScope scope;
   v8::internal::byte buffer[1024];
-  Assembler assm(Isolate::Current(), buffer, sizeof(buffer));
+  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));
   __ movq(rcx, Immediate(3));
   __ movq(rdx, Immediate(4));
   __ movq(rdi, Immediate(5));
@@ skipping 28 matching lines @@
   __ movq(rax, Immediate(13));
   __ pop(rsi);
   __ pop(rdi);
   __ pop(rdx);
   __ pop(rcx);
   __ pop(rbx);
   __ ret(0);
 
   CodeDesc desc;
   assm.GetCode(&desc);
-  Code* code = Code::cast(HEAP->CreateCode(
+  Code* code = Code::cast(isolate->heap()->CreateCode(
       desc,
       Code::ComputeFlags(Code::STUB),
-      v8::internal::Handle<v8::internal::Object>(
-          HEAP->undefined_value()))->ToObjectChecked());
+      v8::internal::Handle<Code>())->ToObjectChecked());
   CHECK(code->IsCode());
 
   F0 f = FUNCTION_CAST<F0>(code->entry());
   int res = f();
   CHECK_EQ(42, res);
 }
 
 
 
 
 #undef __