Remove special charAt and charCodeAt handling in the ICs.

src/stub-cache.cc

Index: src/stub-cache.cc
diff --git a/src/stub-cache.cc b/src/stub-cache.cc
index 414e1ecda129e9c0aae4111d136f270e2e363f0c..7cb02f6a241f97bbe24bdd4b3c4d61798a32244c 100644
--- a/src/stub-cache.cc
+++ b/src/stub-cache.cc
@@ -415,10 +415,8 @@ static void FillCache(Isolate* isolate, Handle<Code> code) {
 
 
 Code* StubCache::FindCallInitialize(int argc, Code::Kind kind) {
-  ExtraICState extra_state =
-      CallICBase::StringStubState::encode(DEFAULT_STRING_STUB);
-  Code::Flags flags =
-      Code::ComputeFlags(kind, UNINITIALIZED, extra_state, Code::NORMAL, argc);
+  Code::Flags flags = Code::ComputeFlags(
+      kind, UNINITIALIZED, kNoExtraICState, Code::NORMAL, argc);
   UnseededNumberDictionary* dictionary =
       isolate()->heap()->non_monomorphic_cache();
   int entry = dictionary->FindEntry(isolate(), flags);
@@ -444,10 +442,8 @@ Code* StubCache::FindPreMonomorphicIC(Code::Kind kind, ExtraICState state) {
 
 
 Handle<Code> StubCache::ComputeCallInitialize(int argc, Code::Kind kind) {
-  ExtraICState extra_state =
-      CallICBase::ComputeExtraICState(DEFAULT_STRING_STUB);
-  Code::Flags flags =
-      Code::ComputeFlags(kind, UNINITIALIZED, extra_state, Code::NORMAL, argc);
+  Code::Flags flags = Code::ComputeFlags(
+      kind, UNINITIALIZED, kNoExtraICState, Code::NORMAL, argc);
   Handle<UnseededNumberDictionary> cache =
       isolate_->factory()->non_monomorphic_cache();
   int entry = cache->FindEntry(isolate_, flags);