Revert "[AMDGPU] Restore the s_memtime instruction in gfx1030"

Broke the ASan/MSan buildbots. See more comments in the original patch,
https://reviews.llvm.org/D97928.

Build failure at http://lab.llvm.org:8011/#/builders/5/builds/5327

This reverts commit fc28f600e558c1344618bda149a068d6162b6f0b.

GitOrigin-RevId: e58d68fcd06ddc7743e0419c0b364df3d44121b6
3 files changed