Right now there is both a v8::internal::RegExp class and a
v8::RegExp class so when code says just "RegExp" the name lookup
depends on what the compiler knows. In some jumbo builds the
compiler suddenly knew about v8::internal::RegExp which made
the symbol lookup choose that class instead of v8::RegExp.

Bug: v8:9359
Change-Id: Ic226d187a397ef2ed4e1e7b415c4f68ba72aa0e6
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1669688
Auto-Submit: Daniel Bratell <bratell@opera.com>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62305}