This adds two tests that generate calls to embedded builtins, one test
inlines the trampoline, and the other uses an indirect load from the
roots array.

Bug: v8:6666, v8:7997
Change-Id: I077f4e9ed311021edb8ee74db625ebb048fdf66b
Reviewed-on: https://chromium-review.googlesource.com/1160237
Commit-Queue: Sigurd Schneider <sigurds@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#54869}