FLAG_wasm_dynamic_tiering is still off by default. When enabled,
it now uses the technique previously behind --new-wasm-dynamic-tiering.

Bug: v8:12281
Change-Id: I365c2c066e62418cd6abc7830f95d1fe0f950e33
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3275570
Commit-Queue: Jakob Kummerow <jkummerow@chromium.org>
Reviewed-by: Andreas Haas <ahaas@chromium.org>
Cr-Commit-Position: refs/heads/main@{#77883}