Introduce LanguageMode, drop StrictMode.

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index ef768c8c6050a640ee3f37f1d2d54c9c905df66c..3f591705d2d2f777c96a89e979d06461bacbe0a3 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -2234,7 +2234,7 @@ class LStoreNamedGeneric FINAL : public LTemplateInstruction<0, 3, 0> {
 
   void PrintDataTo(StringStream* stream) OVERRIDE;
   Handle<Object> name() const { return hydrogen()->name(); }
-  StrictMode strict_mode() { return hydrogen()->strict_mode(); }
+  LanguageMode language_mode() { return hydrogen()->language_mode(); }
 };
 
 
@@ -2291,7 +2291,7 @@ class LStoreKeyedGeneric FINAL : public LTemplateInstruction<0, 4, 0> {
 
   void PrintDataTo(StringStream* stream) OVERRIDE;
 
-  StrictMode strict_mode() { return hydrogen()->strict_mode(); }
+  LanguageMode language_mode() { return hydrogen()->language_mode(); }
 };