[parser] Process source ranges for background parses

Make sure to call MaybeProcessSourceRanges in ParseOnBackground so that
code coverage ranges match between main thread and background compiles.

Bug: chromium:1011762
Change-Id: Ic6194083e425f4160e34a34bceb6034624cf1b9f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2120540Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#66872}

src/parsing/parser.cc

@@ -3111,6 +3111,7 @@ void Parser::ParseOnBackground(ParseInfo* info) {
         DoParseFunction(/* isolate = */ nullptr, info, info->function_name());
   }
   MaybeResetCharacterStream(info, result);
+  MaybeProcessSourceRanges(info, result, stack_limit_);
 
   info->set_literal(result);