Introduce LanguageMode, drop StrictMode.

src/code-stubs.h

 // 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.
 
 #ifndef V8_CODE_STUBS_H_
 #define V8_CODE_STUBS_H_
 
 #include "src/allocation.h"
 #include "src/assembler.h"
 #include "src/codegen.h"
@@ skipping 553 matching lines @@
   // Parameters accessed via CodeStubGraphBuilder::GetParameter()
   static const int kNumber = 0;
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(NumberToString);
   DEFINE_HYDROGEN_CODE_STUB(NumberToString, HydrogenCodeStub);
 };
 
 
 class FastNewClosureStub : public HydrogenCodeStub {
  public:
-  FastNewClosureStub(Isolate* isolate, StrictMode strict_mode,
+  FastNewClosureStub(Isolate* isolate, LanguageMode language_mode,
                      FunctionKind kind)
       : HydrogenCodeStub(isolate) {
     DCHECK(IsValidFunctionKind(kind));
-    set_sub_minor_key(StrictModeBits::encode(strict_mode) |
+    set_sub_minor_key(LanguageModeBits::encode(language_mode) |
                       FunctionKindBits::encode(kind));
   }
 
-  StrictMode strict_mode() const {
-    return StrictModeBits::decode(sub_minor_key());
+  LanguageMode language_mode() const {
+    return LanguageModeBits::decode(sub_minor_key());
   }
 
   FunctionKind kind() const {
     return FunctionKindBits::decode(sub_minor_key());
   }
   bool is_arrow() const { return IsArrowFunction(kind()); }
   bool is_generator() const { return IsGeneratorFunction(kind()); }
   bool is_concise_method() const { return IsConciseMethod(kind()); }
   bool is_default_constructor() const { return IsDefaultConstructor(kind()); }
 
  private:
-  class StrictModeBits : public BitField<StrictMode, 0, 1> {};
+  STATIC_ASSERT(LANGUAGE_END == 2);
+  class LanguageModeBits : public BitField<LanguageMode, 0, 1> {};
   class FunctionKindBits : public BitField<FunctionKind, 1, 4> {};
 
   DEFINE_CALL_INTERFACE_DESCRIPTOR(FastNewClosure);
   DEFINE_HYDROGEN_CODE_STUB(FastNewClosure, HydrogenCodeStub);
 };
 
 
 class FastNewContextStub FINAL : public HydrogenCodeStub {
  public:
   static const int kMaximumSlots = 64;
@@ skipping 2065 matching lines @@
 
 #undef DEFINE_CALL_INTERFACE_DESCRIPTOR
 #undef DEFINE_PLATFORM_CODE_STUB
 #undef DEFINE_HANDLER_CODE_STUB
 #undef DEFINE_HYDROGEN_CODE_STUB
 #undef DEFINE_CODE_STUB
 #undef DEFINE_CODE_STUB_BASE
 } }  // namespace v8::internal
 
 #endif  // V8_CODE_STUBS_H_