Rollforward [compiler,api] Pass non-strings to the modifying callback when unconditional codegen is on.

Original change reviewed in https://chromium-review.googlesource.com/c/v8/v8/+/1917147.

Added an expect fail/pass for the tests that caused a revert in https://chromium-review.googlesource.com/c/chromium/src/+/2184229.

This reverts commit dd1b1de1.

Bug: chromium:1024786
Change-Id: I7db6faa4c17c232a0fafd389fc4a26e8116852c7
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2183910
Auto-Submit: Stefano Sanfilippo <ssanfilippo@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Daniel Vogelheim <vogelheim@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67637}