[PATCH] Fix not caught use-after-scope with -O1 (PR sanitize/78106)

[Martin Liška]

Hello.

While reading and trying to understand sanopt code, I've noticed that we can possibly
optimize out a ASAN_CHECK when there's a BB in between DOM(BB) and BB which can
call a freeing function.

Ready to be installed after it survives regression tests?
Martin
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