[patch] Use "set -o pipefail"

[Rafael Espíndola]

> It seems somewhat dangerous, though, since a test that is meant to
> exit with a non-zero status could start crashing instead without
> causing any test failures (depending on what other checks were in the
> pipeline).

Good point.

> Maybe this should be another utility instead? It could even be the
> same binary but symlinked and have the behavior depend on the name...

I have added a --crash option to not instead. New patches for llvm and
clang are attached.

> Stephen

Cheers,
Rafael
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