Replace boolean indications of strict mode by an enum value.

src/arm/lithium-codegen-arm.h

Index: src/arm/lithium-codegen-arm.h
diff --git a/src/arm/lithium-codegen-arm.h b/src/arm/lithium-codegen-arm.h
index d13e7d41508ef135dd63ba59576571e502e76004..b01e4967d77a62f7baf45d7905abfe1ddfd815d3 100644
--- a/src/arm/lithium-codegen-arm.h
+++ b/src/arm/lithium-codegen-arm.h
@@ -140,8 +140,8 @@ class LCodeGen BASE_EMBEDDED {
   bool is_done() const { return status_ == DONE; }
   bool is_aborted() const { return status_ == ABORTED; }
 
-  int strict_mode_flag() const {
-    return info()->is_strict_mode() ? kStrictMode : kNonStrictMode;
+  StrictModeFlag strict_mode_flag() const {
+    return info()->strict_mode_flag();
   }
 
   LChunk* chunk() const { return chunk_; }