Eliminate extended mode, and other modes clean-up

src/a64/lithium-a64.h

Index: src/a64/lithium-a64.h
diff --git a/src/a64/lithium-a64.h b/src/a64/lithium-a64.h
index 26234e92429f0fadfc0eb64b32cefd5ec253acc2..b1081c133c91e248ba5b8367138ec18ff3525a00 100644
--- a/src/a64/lithium-a64.h
+++ b/src/a64/lithium-a64.h
@@ -2341,7 +2341,7 @@ 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(); }
 };
 
 
@@ -2390,7 +2390,7 @@ 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(); }
 };