[stubs] Refactor StringCompareStub and use it for HStringCompareAndBranch.

src/x64/interface-descriptors-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/interface-descriptors.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 32 matching lines @@
 
 
 const Register StoreGlobalViaContextDescriptor::SlotRegister() { return rbx; }
 const Register StoreGlobalViaContextDescriptor::ValueRegister() { return rax; }
 
 
 const Register InstanceOfDescriptor::LeftRegister() { return rdx; }
 const Register InstanceOfDescriptor::RightRegister() { return rax; }
 
 
+const Register StringCompareDescriptor::LeftRegister() { return rdx; }
+const Register StringCompareDescriptor::RightRegister() { return rax; }
+
+
 const Register ArgumentsAccessReadDescriptor::index() { return rdx; }
 const Register ArgumentsAccessReadDescriptor::parameter_count() { return rax; }
 
 
 const Register ApiGetterDescriptor::function_address() { return r8; }
 
 
 const Register MathPowTaggedDescriptor::exponent() { return rdx; }
 
 
@@ skipping 327 matching lines @@
       rbx,  // address of first argument
       rdi   // the target callable to be call
   };
   data->InitializePlatformSpecific(arraysize(registers), registers);
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64