[CMake][libcxx] Support HWASan

[phosek]

Summary

This is analogous to ASan.

[ldionne]

I assume we should also add the ability to test libc++ that way? If so, let's add it (libcxx/utils/libcxx/test/params.py:129). How is HWAddress different from Address? Is it worth adding a CI job?

[phosek]

In D127608#3578073, @ldionne wrote:

I assume we should also add the ability to test libc++ that way? If so, let's add it (libcxx/utils/libcxx/test/params.py:129).

Done.

How is HWAddress different from Address? Is it worth adding a CI job?

It uses TBI on AArch64 to reduce performance overhead. Do we have AArch64 machines in CI?

[phosek]

@ldionne Ping?

[Mordante]

Parts of this work seem the have landed in https://reviews.llvm.org/rG18014fe0a9bf41775e377db7a4214a159f79f257 can you rebase this patch and see whether there is anything left?