[llvm] [AMDGPU] Prefer `s_memtime` for `readcyclecounter` on GFX10 (PR #80211)

[via llvm-commits]

b-sumner wrote:

Umm...the cycle counter on gfx11 is 20 bits wide.  I would oppose an attempt to implement the cycle counter with the realtime counter.

https://github.com/llvm/llvm-project/pull/80211