If PreParser::ParseFormalParameterList detects a stack overflow, make
PreParseFunction actually return kPreParseStackOverflow.

BUG=chromium:899495

Change-Id: I1f347b56c594c6edd25401b8448ff38117e190a9
Reviewed-on: https://chromium-review.googlesource.com/c/1304536
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#57103}