Fix bug in 64 bit codegen causing us to always go slowcase in apply....

src/x64/codegen-x64.cc

 // Copyright 2010 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 2601 matching lines @@
 
       // Check that applicand.apply is Function.prototype.apply.
       __ movq(rax, Operand(rsp, kPointerSize));
       is_smi = masm_->CheckSmi(rax);
       __ j(is_smi, &build_args);
       __ CmpObjectType(rax, JS_FUNCTION_TYPE, rcx);
       __ j(not_equal, &build_args);
       __ movq(rcx, FieldOperand(rax, JSFunction::kCodeEntryOffset));
       __ subq(rcx, Immediate(Code::kHeaderSize - kHeapObjectTag));
       Handle<Code> apply_code(Builtins::builtin(Builtins::FunctionApply));
-      __ Cmp(FieldOperand(rcx, SharedFunctionInfo::kCodeOffset), apply_code);
+      __ Cmp(rcx, apply_code);
       __ j(not_equal, &build_args);
 
       // Check that applicand is a function.
       __ movq(rdi, Operand(rsp, 2 * kPointerSize));
       is_smi = masm_->CheckSmi(rdi);
       __ j(is_smi, &build_args);
       __ CmpObjectType(rdi, JS_FUNCTION_TYPE, rcx);
       __ j(not_equal, &build_args);
 
       // Copy the arguments to this function possibly from the
@@ skipping 10219 matching lines @@
 #undef __
 
 void RecordWriteStub::Generate(MacroAssembler* masm) {
   masm->RecordWriteHelper(object_, addr_, scratch_);
   masm->ret(0);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64