Made Isolate a mandatory parameter for everything Handle-related.

test/cctest/test-assembler-x64.cc

Index: test/cctest/test-assembler-x64.cc
diff --git a/test/cctest/test-assembler-x64.cc b/test/cctest/test-assembler-x64.cc
index d81923fa5c227d3e174b602a8f6464fdfb82311a..af06b013aa3939fdb7100c16357aa4f7f4a0054e 100644
--- a/test/cctest/test-assembler-x64.cc
+++ b/test/cctest/test-assembler-x64.cc
@@ -376,7 +376,8 @@ 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);
@@ -425,11 +426,10 @@ TEST(AssemblerMultiByteNop) {
 
   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());