MarkCandidatesForOptimizationFromBytecode/
MarkCandidatesForOptimizationFromCode are called when bytecode budget
interrupt occurs from interpreted / optimized code. The logic in these
two functions is very similar. This cl merges this logic into one
function.

This cl also removes FLAG_frame_count which specifies the
number of frames we need to look at for tiering up on a bytecode
budget interrupt. The default value is set to 1 and in its current
form it isn't very useful.

Bug: v8:9684
Change-Id: I9f56034f2857672921673b9b68b3615765c0ccfe
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2565514
Commit-Queue: Mythri Alle <mythria@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#71561}