Make whether or not a Code object should be created by masm explicit

src/mips64/code-stubs-mips64.h

Index: src/mips64/code-stubs-mips64.h
diff --git a/src/mips64/code-stubs-mips64.h b/src/mips64/code-stubs-mips64.h
index 2e18f59915aa183dc192b8e17d5b67ed60b67a2d..7b187c14b7ba7d36dec6dc9f1c7448c73ba945ca 100644
--- a/src/mips64/code-stubs-mips64.h
+++ b/src/mips64/code-stubs-mips64.h
@@ -141,9 +141,8 @@ class RecordWriteStub: public PlatformCodeStub {
   }
 
   static void Patch(Code* stub, Mode mode) {
-    MacroAssembler masm(NULL,
-                        stub->instruction_start(),
-                        stub->instruction_size());
+    MacroAssembler masm(stub->GetIsolate(), stub->instruction_start(),
+                        stub->instruction_size(), false);
     switch (mode) {
       case STORE_BUFFER_ONLY:
         DCHECK(GetMode(stub) == INCREMENTAL ||