[strong] Refactor ObjectStrength into a replacement for strong boolean args

test/cctest/compiler/test-js-context-specialization.cc

Index: test/cctest/compiler/test-js-context-specialization.cc
diff --git a/test/cctest/compiler/test-js-context-specialization.cc b/test/cctest/compiler/test-js-context-specialization.cc
index 5ced9b84beb0e9d7314efc06ebc4917c5d49a6a9..95b16fa080fc2d169bde30ca128b80946cec0340 100644
--- a/test/cctest/compiler/test-js-context-specialization.cc
+++ b/test/cctest/compiler/test-js-context-specialization.cc
@@ -217,7 +217,7 @@ TEST(SpecializeToContext) {
         t.graph()->NewNode(t.simplified()->ChangeTaggedToInt32(), other_load);
 
     Node* add =
-        t.graph()->NewNode(t.javascript()->Add(LanguageMode::SLOPPY), value_use,
+        t.graph()->NewNode(t.javascript()->Add(Strength::NORMAL), value_use,
                            other_use, param_context, other_load, start);
 
     Node* ret =