`FrameIsInternal` is a function that improves report quality by filtering out
internal functions from the sanitizer, allowing it to point to a more precise
root cause. However, the current checks are mostly specific to compiler-rt,
so we are adding a few more rules to enhance the filtering for libsanitizer as
well.
The following patch is result of libsanitizer/merge.sh
from c425db2eb558c263 (yesterday evening).
Bootstrapped/regtested on x86_64-linux and i686-linux (together with
the follow-up 3 patches I'm about to post).
BTW, seems upstream has added riscv64 support for I think lsan/tsan,
so if anyone is willing to try it there, it would be a matter of
copying e.g. the s390*-*-linux* libsanitizer/configure.tgt entry
to riscv64-*-linux* with the obvious s/s390x/riscv64/ change in it.
Kito Cheng