This reverts commit cc237d87.

Reason for revert: breaks win clang:
https://build.chromium.org/p/client.v8/builders/V8%20Win64%20-%20clang/builds/8538

Original change's description:
> Reland "[wasm] trap handlers: fall back on old signal handler"
> 
> This is a reland of ee4fe896
> Original change's description:
> > [wasm] trap handlers: fall back on old signal handler
> > 
> > This is primarily needed to test D8 under ASan. ASan installs a signal handler
> > early in the process startup to show stack traces from crashes. We need to make
> > sure that if V8 does not handle a signal then the existing handler gets a
> > chance.
> > 
> > This change only applies when using V8's default signal handler. When
> > integrating with the embedder's signal handler the behavior is unchanged.
> > 
> > Bug: chromium:771948
> > Change-Id: Ifd560acf9700ec5f714f009530258fa92c83cabe
> > Reviewed-on: https://chromium-review.googlesource.com/705823
> > Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> > Commit-Queue: Eric Holk <eholk@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#48429}
> 
> Bug: chromium:771948
> Change-Id: Ide307091c432fd933c48f89c51851b8dce44dd30
> Reviewed-on: https://chromium-review.googlesource.com/710114
> Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
> Commit-Queue: Eric Holk <eholk@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#48435}

TBR=mseaborn@chromium.org,bradnelson@chromium.org,gdeepti@chromium.org,eholk@chromium.org,mark@chromium.org

Change-Id: If71f61ae186fc6be2006edeb2dffd7e2b6827d91
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: chromium:771948
Reviewed-on: https://chromium-review.googlesource.com/711854Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48436}