[runtime] Replace COMPARE/COMPARE_STRONG with proper Object::Compare.

src/hydrogen.cc

 // Copyright 2013 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.
 
 #include "src/hydrogen.h"
 
 #include <sstream>
 
 #include "src/allocation-site-scopes.h"
 #include "src/ast-numbering.h"
@@ skipping 12460 matching lines @@
 // Fast support for SubString.
 void HOptimizedGraphBuilder::GenerateSubString(CallRuntime* call) {
   DCHECK_EQ(3, call->arguments()->length());
   CHECK_ALIVE(VisitExpressions(call->arguments()));
   PushArgumentsFromEnvironment(call->arguments()->length());
   HCallStub* result = New<HCallStub>(CodeStub::SubString, 3);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
-// Fast support for StringCompare.
-void HOptimizedGraphBuilder::GenerateStringCompare(CallRuntime* call) {
-  DCHECK_EQ(2, call->arguments()->length());
-  CHECK_ALIVE(VisitExpressions(call->arguments()));
-  PushArgumentsFromEnvironment(call->arguments()->length());
-  HCallStub* result = New<HCallStub>(CodeStub::StringCompare, 2);
-  return ast_context()->ReturnInstruction(result, call->id());
-}
-
-
 void HOptimizedGraphBuilder::GenerateStringGetLength(CallRuntime* call) {
   DCHECK(call->arguments()->length() == 1);
   CHECK_ALIVE(VisitForValue(call->arguments()->at(0)));
   HValue* string = Pop();
   HInstruction* result = BuildLoadStringLength(string);
   return ast_context()->ReturnInstruction(result, call->id());
 }
 
 
 // Support for direct calls from JavaScript to native RegExp code.
@@ skipping 1043 matching lines @@
     isolate()->GetHTracer()->TraceHydrogen(name(), graph_);
   }
 
 #ifdef DEBUG
   graph_->Verify(false);  // No full verify.
 #endif
 }
 
 }  // namespace internal
 }  // namespace v8