Remove the obsolete OverwriteMode optimization.

src/code-stubs.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.
 
 #include "src/code-stubs.h"
 
 #include <sstream>
 
 #include "src/bootstrapper.h"
 #include "src/cpu-profiler.h"
@@ skipping 250 matching lines @@
   void** value_out = reinterpret_cast<void**>(&code);
   Dispatch(isolate, key, value_out, &GetCodeDispatchCall);
   return scope.CloseAndEscape(code);
 }
 
 
 // static
 void BinaryOpICStub::GenerateAheadOfTime(Isolate* isolate) {
   // Generate the uninitialized versions of the stub.
   for (int op = Token::BIT_OR; op <= Token::MOD; ++op) {
-    for (int mode = NO_OVERWRITE; mode <= OVERWRITE_RIGHT; ++mode) {
-      BinaryOpICStub stub(isolate,
-                          static_cast<Token::Value>(op),
-                          static_cast<OverwriteMode>(mode));
-      stub.GetCode();
-    }
+    BinaryOpICStub stub(isolate, static_cast<Token::Value>(op));
+    stub.GetCode();
   }
 
   // Generate special versions of the stub.
   BinaryOpICState::GenerateAheadOfTime(isolate, &GenerateAheadOfTime);
 }
 
 
 void BinaryOpICStub::PrintState(std::ostream& os) const {  // NOLINT
   os << state();
 }
@@ skipping 690 matching lines @@
 }
 
 
 InternalArrayConstructorStub::InternalArrayConstructorStub(
     Isolate* isolate) : PlatformCodeStub(isolate) {
   InternalArrayConstructorStubBase::GenerateStubsAheadOfTime(isolate);
 }
 
 
 } }  // namespace v8::internal