[HWASan] Remove -Wa,-mrelax-relocations=no flag.

We no longer need it after https://reviews.llvm.org/D113220.

Reviewed By: vitalybuka

Differential Revision: https://reviews.llvm.org/D113221

GitOrigin-RevId: 5684a614dd1c1912feda712be0b14923b7c92c00
2 files changed