At the start of the graph builder, we add merge states to exception
handlers basic block with ExceptionPhis (normal phis with no input,
but with an interpreter register "owner").

Every Node that can throw, can also lazy deopt, so we use the
lazy deopt IFS to recover the exception phi values in a trampoline
before jumping to the exception catch block.

Bug: v8:7700
Change-Id: I62fe7f19ce5e89c3df645224ea62f9fc2798207c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865865Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Victor Gomes <victorgomes@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82935}