Revert of Fix compiler warnings on "make android_arm"

src/compiler/js-operator.h

Index: src/compiler/js-operator.h
diff --git a/src/compiler/js-operator.h b/src/compiler/js-operator.h
index e5876a1a260de9558652a5898d738dc68361dc3c..19022fa8814c5ce64b437bf9f11d4bd373f59ec4 100644
--- a/src/compiler/js-operator.h
+++ b/src/compiler/js-operator.h
@@ -374,9 +374,9 @@
 
 const CreateLiteralParameters& CreateLiteralParametersOf(const Operator* op);
 
-BinaryOperationHint BinaryOperationHintOf(const Operator* op);
-
-CompareOperationHint CompareOperationHintOf(const Operator* op);
+const BinaryOperationHint BinaryOperationHintOf(const Operator* op);
+
+const CompareOperationHint CompareOperationHintOf(const Operator* op);
 
 // Interface for building JavaScript-level operators, e.g. directly from the
 // AST. Most operators have no parameters, thus can be globally shared for all