This fixes a crash with a predicate used during stack unwinding of
WebAssembly frames during exception handling. The predicate caused an
observable side-effect in JavaScript during unwinding, code that is
inherently unhandlified and is not allowed to be observable.

The fix actually just removes the entire predicate. This is because the
updated proposal causes all JavaScript exceptions to participate in
WebAssembly exception handling, allowing modelling of "finally" language
constructs to perform cleanup independent of the embedders exception
details.

R=ahaas@chromium.org
TEST=mjsunit/regress/wasm/regress-8095
BUG=v8:8095

Change-Id: Ic03bc45e7b7f4562a431ccf910ee9ddcf558aa48
Reviewed-on: https://chromium-review.googlesource.com/1193445Reviewed-by: Andreas Haas <ahaas@chromium.org>
Commit-Queue: Michael Starzinger <mstarzinger@chromium.org>
Cr-Commit-Position: refs/heads/master@{#55457}