Introduce LanguageMode, drop StrictMode.

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 128 matching lines @@
 int FunctionLiteral::start_position() const {
   return scope()->start_position();
 }
 
 
 int FunctionLiteral::end_position() const {
   return scope()->end_position();
 }
 
 
-StrictMode FunctionLiteral::strict_mode() const {
-  return scope()->strict_mode();
+LanguageMode FunctionLiteral::language_mode() const {
+  return scope()->language_mode();
 }
 
 
 bool FunctionLiteral::uses_super_property() const {
   DCHECK_NOT_NULL(scope());
   return scope()->uses_super_property() || scope()->inner_uses_super_property();
 }
 
 
 bool FunctionLiteral::uses_super_constructor_call() const {
@@ skipping 881 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