Turboprop-generated Code objects will now have the dedicated
TURBOPROP code kind instead of OPTIMIZED_FUNCTION. When possible,
the code kind is used as the source of truth instead of
FLAG_turboprop. This is the initial step towards implementing
tier-up from Turboprop to Turbofan.

Future work: Rename OPTIMIZED_FUNCTION to TURBOFAN, rename STUB to
DEOPT_ENTRIES_OR_FOR_TESTING, implement TP tier-up.

No-Try: true
Bug: v8:9684
Cq-Include-Trybots: luci.v8.try:v8_linux64_fyi_rel_ng
Change-Id: I3c9308718d7e9a2b7e6796e7ea94f17e5ff84c0a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2424140
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Mythri Alle <mythria@chromium.org>
Reviewed-by: Ross McIlroy <rmcilroy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#70213}