When encountering uninitialized feedback, mark the environment as dead
such that we skip over the following bytecodes. Start full processing
again when we reach a bytecode that is either a jump target or an
exception handler entry. For now, don't support this optimization when
compiling for OSR.

Bug: v8:7790
Change-Id: I8177b7fa31ea43d205a2708310b0b0e67302001e
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1621930
Commit-Queue: Georg Neis <neis@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#61781}