Introduce extended mode.

src/arm/lithium-arm.h

Index: src/arm/lithium-arm.h
diff --git a/src/arm/lithium-arm.h b/src/arm/lithium-arm.h
index 5a73bed4dbe6a6ee9ad0623dca59e399f2a29cbe..8e0d67ee11bd171d139e128c9a8e7dc292071524 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -1225,7 +1225,7 @@ class LStoreGlobalGeneric: public LTemplateInstruction<0, 2, 0> {
   LOperand* global_object() { return InputAt(0); }
   Handle<Object> name() const { return hydrogen()->name(); }
   LOperand* value() { return InputAt(1); }
-  bool strict_mode() { return hydrogen()->strict_mode(); }
+  StrictModeFlag strict_mode_flag() { return hydrogen()->strict_mode_flag(); }
 };
 
 
@@ -1585,7 +1585,6 @@ class LStoreNamedGeneric: public LTemplateInstruction<0, 2, 0> {
   LOperand* value() { return inputs_[1]; }
   Handle<Object> name() const { return hydrogen()->name(); }
   StrictModeFlag strict_mode_flag() { return hydrogen()->strict_mode_flag(); }
-  bool strict_mode() { return strict_mode_flag() == kStrictMode; }
 };
 
 
@@ -1647,7 +1646,7 @@ class LStoreKeyedGeneric: public LTemplateInstruction<0, 3, 0> {
   LOperand* object() { return inputs_[0]; }
   LOperand* key() { return inputs_[1]; }
   LOperand* value() { return inputs_[2]; }
-  bool strict_mode() { return hydrogen()->strict_mode(); }
+  StrictModeFlag strict_mode_flag() { return hydrogen()->strict_mode_flag(); }
 };
 
 class LStoreKeyedSpecializedArrayElement: public LTemplateInstruction<0, 3, 0> {