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 d45d672cdd998f65d5957f34762b0d9fb9b044a8..f4b07454d76e4b39b223151d5f9a39a5c0020501 100644
--- a/src/parsing/preparser.h
+++ b/src/parsing/preparser.h
@@ -953,11 +953,6 @@ 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);