X64: Enable inline caching for calls, with some stubs stubbed out.

src/stub-cache.cc

 // Copyright 2006-2009 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 845 matching lines @@
     LOG(CodeCreateEvent(Logger::CALL_INITIALIZE_TAG,
                         code, code->arguments_count()));
   }
   return result;
 }
 
 
 Object* StubCompiler::CompileCallPreMonomorphic(Code::Flags flags) {
   HandleScope scope;
   int argc = Code::ExtractArgumentsCountFromFlags(flags);
+  // The code of the PreMonomorphic stub is the same as the code
+  // of the Initialized stub.  They just differ on the code object flags.
   CallIC::GenerateInitialize(masm(), argc);
   Object* result = GetCodeWithFlags(flags, "CompileCallPreMonomorphic");
   if (!result->IsFailure()) {
     Counters::call_premonomorphic_stubs.Increment();
     Code* code = Code::cast(result);
     USE(code);
     LOG(CodeCreateEvent(Logger::CALL_PRE_MONOMORPHIC_TAG,
                         code, code->arguments_count()));
   }
   return result;
@@ skipping 133 matching lines @@
   int argc = arguments_.immediate();
   Code::Flags flags = Code::ComputeMonomorphicFlags(Code::CALL_IC,
                                                     type,
                                                     in_loop_,
                                                     argc);
   return GetCodeWithFlags(flags, name);
 }
 
 
 } }  // namespace v8::internal