This adds support to wire control flow of catch-all expressions into an
existing try-catch cascade. Note that multiple typed catch blocks are
not yet supported, only one typed catch block followed by one catch-all
block is supported.

In case the explicit catch-all block is missing, we emulate the correct
semantics by internally always emitting a catch-all containing a simple
rethrow instruction.

R=clemensh@chromium.org
TEST=mjsunit/wasm/exceptions-catchall
BUG=v8:8091

Change-Id: I6b29a98c4f1a558fabe6012f4ba6c7b7d43529bb
Reviewed-on: https://chromium-review.googlesource.com/c/1270585Reviewed-by: Clemens Hammacher <clemensh@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56476}