Inline number to string conversion for string addition into BinaryOp(Stub).

src/hydrogen.h

Index: src/hydrogen.h
diff --git a/src/hydrogen.h b/src/hydrogen.h
index bd28ba1b74d55da9df2dd5c11cc615a6c4ba4f0b..e7b1086a4e702180bd67453d9cbb4ead8832e656 100644
--- a/src/hydrogen.h
+++ b/src/hydrogen.h
@@ -1234,13 +1234,7 @@ class HGraphBuilder {
                                    ElementsKind to_kind,
                                    bool is_jsarray);
 
-  // Do lookup in the number string cache. If the object is not found
-  // in the cache, the false branch of the continuation is taken;
-  // otherwise the true branch is taken and the returned value contains
-  // the cache value for the object. The returned value must NOT be used
-  // on the false branch.
-  HValue* BuildLookupNumberStringCache(HValue* object,
-                                       HIfContinuation* continuation);
+  HValue* BuildSmiToString(HValue* number);
   HValue* BuildNumberToString(HValue* number);
 
   HInstruction* BuildUncheckedMonomorphicElementAccess(