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

Bug: v8:7700
Change-Id: I36f3964bb5bb72b35f65f454c3ad3db0656c14bd
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3825877
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82383}