Port 8b4272c2

Original Commit Message:

    There's no need to decode the tiering state in generated code - merge
    these runtime functions and decode in the new generic CompileOptimized
    runtime function instead.

    CompileMaglev_Synchronized
    CompileMaglev_Concurrent
    CompileTurbofan_Synchronized
    CompileTurbofan_Concurrent

    ->

    CompileOptimized

R=jgruber@chromium.org, joransiu@ca.ibm.com, junyan@redhat.com, midawson@redhat.com
BUG=
LOG=N

Change-Id: Ia61852825fc747ad7fec9983a18bf4e9d4245ad0
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3826053
Commit-Queue: Milad Farazmand <mfarazma@redhat.com>
Reviewed-by: Junliang Yan <junyan@redhat.com>
Cr-Commit-Position: refs/heads/main@{#82417}