[scudo] Fix running tests under hwasan.

When built with hwasan, assume that the target architecture does not
support TBI. HWASan uses that byte for its own purpose, and changing it
breaks things.

Reviewed By: hctim

Differential Revision: https://reviews.llvm.org/D111842

GitOrigin-RevId: 439e00a25bde9df851c6f25e356f11f83e884c2f
1 file changed