Make stack_parameter_count a plain register.

src/code-stubs.cc

 // Copyright 2012 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 23 matching lines @@
 #include "factory.h"
 #include "gdb-jit.h"
 #include "macro-assembler.h"
 
 namespace v8 {
 namespace internal {
 
 
 CodeStubInterfaceDescriptor::CodeStubInterfaceDescriptor()
     : register_param_count_(-1),
-      stack_parameter_count_(NULL),
+      stack_parameter_count_(no_reg),
       hint_stack_parameter_count_(-1),
       function_mode_(NOT_JS_FUNCTION_STUB_MODE),
       register_params_(NULL),
       deoptimization_handler_(NULL),
       miss_handler_(),
       has_miss_handler_(false) { }
 
 
 bool CodeStub::FindCodeInCache(Code** code_out, Isolate* isolate) {
   UnseededNumberDictionary* stubs = isolate->heap()->code_stubs();
@@ skipping 1108 matching lines @@
   InstallDescriptor(isolate, &stub3);
 }
 
 InternalArrayConstructorStub::InternalArrayConstructorStub(
     Isolate* isolate) {
   InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
 }
 
 
 } }  // namespace v8::internal