Eliminate extended mode, and other modes clean-up

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index a58208c816f4f0471be89a44f6e6374b2bc0acdc..67c107fe7cefcd6e86d7b457de0ba3902cd8b3e9 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -2052,7 +2052,7 @@ class LStoreNamedGeneric V8_FINAL : public LTemplateInstruction<0, 3, 0> {
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 
   Handle<Object> name() const { return hydrogen()->name(); }
-  StrictModeFlag strict_mode_flag() { return hydrogen()->strict_mode_flag(); }
+  StrictMode strict_mode() { return hydrogen()->strict_mode(); }
 };
 
 
@@ -2107,7 +2107,7 @@ class LStoreKeyedGeneric V8_FINAL : public LTemplateInstruction<0, 4, 0> {
 
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 
-  StrictModeFlag strict_mode_flag() { return hydrogen()->strict_mode_flag(); }
+  StrictMode strict_mode() { return hydrogen()->strict_mode(); }
 };