PreParser types, e.g., PreParserExpression, PreParserList,
PreParserFormalParameter.  This also enhances ThreadedLists to be used
on the same class more than once.

Bug: v8:7926
Change-Id: Ied204120e5d12ab1f1c4192f6b3c05971a12683b
Reviewed-on: https://chromium-review.googlesource.com/1199262
Commit-Queue: Florian Sattler <sattlerf@google.com>
Reviewed-by: Camillo Bruni <cbruni@chromium.org>
Reviewed-by: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55584}