[PATCH] Add pretty printer for ASAN_MARK and add a helper fn

[Martin Liška]

It would be easier to read ASAN_MARK (UNPOISON, &a, 4); instead of
ASAN_MARK (2, &a, 4); Apart from that new helper function asan_mark_p
is added.

Patch can bootstrap on ppc64le-redhat-linux and survives regression tests.

Ready to be installed?
Martin


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