Replace boolean indications of strict mode by an enum value.

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 34b4adc4cd16f1de202df7ebbe83eda1ef6e682a..5733bd08da82fe9946b45db2085a7c65607b5a98 100644
--- a/src/arm/lithium-arm.h
+++ b/src/arm/lithium-arm.h
@@ -1582,7 +1582,8 @@ class LStoreNamedGeneric: public LTemplateInstruction<0, 2, 0> {
   LOperand* object() { return inputs_[0]; }
   LOperand* value() { return inputs_[1]; }
   Handle<Object> name() const { return hydrogen()->name(); }
-  bool strict_mode() { return hydrogen()->strict_mode(); }
+  StrictModeFlag strict_mode_flag() { return hydrogen()->strict_mode_flag(); }
+  bool strict_mode() { return strict_mode_flag() == kStrictMode; }
 };