Move desugaring of super calls with trailing spread to one runtime call.

src/parsing/preparser.h

Index: src/parsing/preparser.h
diff --git a/src/parsing/preparser.h b/src/parsing/preparser.h
index f8afe17b0a0b8af8a0e848e7893495259ece0b25..01a7503c1f545903d770f687b172d04d6fce513a 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -952,11 +952,6 @@ class PreParser : public ParserBase<PreParser> {
   V8_INLINE void MarkCollectedTailCallExpressions() {}
   V8_INLINE void MarkTailPosition(PreParserExpression expression) {}
 
-  V8_INLINE PreParserExpressionList
-  PrepareSpreadArguments(PreParserExpressionList list) {
-    return list;
-  }
-
   V8_INLINE PreParserExpression SpreadCall(PreParserExpression function,
                                            PreParserExpressionList args,
                                            int pos);