Remove --experimental-classes flag and related dead code.

src/ast.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/ast.h"
 
 #include <cmath>  // For isfinite.
 #include "src/builtins.h"
 #include "src/code-stubs.h"
 #include "src/contexts.h"
@@ skipping 549 matching lines @@
   if (IsUsingCallFeedbackSlot(isolate) || call_type == POSSIBLY_EVAL_CALL) {
     return false;
   }
   return true;
 }
 
 
 bool Call::IsUsingCallFeedbackSlot(Isolate* isolate) const {
   // SuperConstructorCall uses a CallConstructStub, which wants
   // a Slot, not an IC slot.
-  return FLAG_experimental_classes && GetCallType(isolate) == SUPER_CALL;
+  return GetCallType(isolate) == SUPER_CALL;
 }
 
 
 FeedbackVectorRequirements Call::ComputeFeedbackRequirements(Isolate* isolate) {
   int ic_slots = IsUsingCallFeedbackICSlot(isolate) ? 1 : 0;
   int slots = IsUsingCallFeedbackSlot(isolate) ? 1 : 0;
   // A Call uses either a slot or an IC slot.
   DCHECK((ic_slots & slots) == 0);
   return FeedbackVectorRequirements(slots, ic_slots);
 }
@@ skipping 438 matching lines @@
 // static
 bool Literal::Match(void* literal1, void* literal2) {
   const AstValue* x = static_cast<Literal*>(literal1)->raw_value();
   const AstValue* y = static_cast<Literal*>(literal2)->raw_value();
   return (x->IsString() && y->IsString() && *x->AsString() == *y->AsString()) ||
          (x->IsNumber() && y->IsNumber() && x->AsNumber() == y->AsNumber());
 }
 
 
 } }  // namespace v8::internal