[llvm] [WIP][AMDGPU][SIInsertWaitcnts] Do not add s_waitcnt when the counters are known to be 0 already (PR #65735)

[Jay Foad via llvm-commits]

================
@@ -1277,9 +1277,18 @@ def S_WAKEUP : SOPP_Pseudo <"s_wakeup", (ins) > {
   let mayStore = 1;
 }
 
-let hasSideEffects = 1 in
----------------
jayfoad wrote:

Why is this removed?

https://github.com/llvm/llvm-project/pull/65735