Make the GC aware of JSReceiver pointers in LookupResults.

src/x64/stub-cache-x64.cc

 // Copyright 2011 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 2203 matching lines @@
   // rsp[argc * 8]       : argument 1
   // rsp[(argc + 1) * 8] : argument 0 = receiver
   // -----------------------------------
   Label miss;
 
   GenerateNameCheck(name, &miss);
 
   // Get the number of arguments.
   const int argc = arguments().immediate();
 
-  LookupResult lookup;
+  LookupResult lookup(isolate());
   LookupPostInterceptor(holder, name, &lookup);
 
   // Get the receiver from the stack.
   __ movq(rdx, Operand(rsp, (argc + 1) * kPointerSize));
 
   CallInterceptorCompiler compiler(this, arguments(), rcx, extra_ic_state_);
   MaybeObject* result = compiler.Compile(masm(),
                                          object,
                                          holder,
                                          name,
@@ skipping 523 matching lines @@
 MaybeObject* LoadStubCompiler::CompileLoadInterceptor(JSObject* receiver,
                                                       JSObject* holder,
                                                       String* name) {
   // ----------- S t a t e -------------
   //  -- rax    : receiver
   //  -- rcx    : name
   //  -- rsp[0] : return address
   // -----------------------------------
   Label miss;
 
-  LookupResult lookup;
+  LookupResult lookup(isolate());
   LookupPostInterceptor(holder, name, &lookup);
 
   // TODO(368): Compile in the whole chain: all the interceptors in
   // prototypes and ultimate answer.
   GenerateLoadInterceptor(receiver,
                           holder,
                           &lookup,
                           rax,
                           rcx,
                           rdx,
@@ skipping 163 matching lines @@
   // -----------------------------------
   Label miss;
 
   Counters* counters = isolate()->counters();
   __ IncrementCounter(counters->keyed_load_interceptor(), 1);
 
   // Check that the name has not changed.
   __ Cmp(rax, Handle<String>(name));
   __ j(not_equal, &miss);
 
-  LookupResult lookup;
+  LookupResult lookup(isolate());
   LookupPostInterceptor(holder, name, &lookup);
   GenerateLoadInterceptor(receiver,
                           holder,
                           &lookup,
                           rdx,
                           rax,
                           rcx,
                           rbx,
                           rdi,
                           name,
@@ skipping 841 matching lines @@
   Handle<Code> ic_miss = masm->isolate()->builtins()->KeyedStoreIC_Miss();
   __ jmp(ic_miss, RelocInfo::CODE_TARGET);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64