Reland "Restore default behaviour of signal handling"

This reverts commit 953be7a3.

Reason for revert: Tests no longer run under ASan/UBSan

Rather than exiting with an exit code representing the signal
(SIGSEGV/SIGFPE), sanitizers return a generic SIGABRT, which makes
the tests fail. The respective tests are now disabled if any sanitizer
is present.

Original change's description:
> Revert "Restore default behaviour of signal handling"
>
> This reverts commit 46b18e26.
>
> Reason for revert: Sheriff. Broke android-asna.
> crbug.com/1195009
>
> Original change's description:
> > Restore default behaviour of signal handling
> >
> > Arm's new security features (PAC, BTI, MTE) often crash the process with
> > an appropriate signal in the event of a security problem. When writing
> > tests to verify this behaviour, it is crucial to ensure that tests exit
> > with exit codes that reflect the signal.
> >
> > For Linux this patch removes the explicit termination of the process via
> > exit(1) and re-raises the signal to invoke the default signal handler
> > and ensure proper (default) handling of the signal, including exiting
> > with correct exit code.
> >
> > On other posix compliant operating systems the signal handler still
> > terminates the process with an exit code of 1.
> >
> > Bug: 1137393, 1145581
> > Change-Id: I0260f8bbccafe38860cef2dbc696701b57fc155c
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2777558


> > Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> > Reviewed-by: Chris Palmer <palmer@chromium.org>
> > Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
> > Commit-Queue: Richard Townsend <richard.townsend@arm.com>
> > Cr-Commit-Position: refs/heads/master@{#868466}
>
> Bug: 1137393
> Bug: 1145581
> Bug: 1195009
> Change-Id: I8808476cdfb05cccf2d9ee5bcb1674319ddf7c6a
> No-Presubmit: true
> No-Tree-Checks: true
> No-Try: true
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2799936
> Commit-Queue: Gabriel Charette <gab@chromium.org>
> Owners-Override: Gabriel Charette <gab@chromium.org>
> Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
> Cr-Commit-Position: refs/heads/master@{#868517}

Bug: 1137393
Bug: 1145581
Bug: 1195009
Test: base_unittests headless_browsertests browser_tests sync_integration_tests
Change-Id: Ibd6b47fb09cdba0248be0807dda850e54b54e059
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2799834


Commit-Queue: Richard Townsend <richard.townsend@arm.com>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Andrey Kosyakov <caseq@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#871851}