[llvm] [AMDGPU][True16][CodeGen] update waitcnt for true16 (PR #128927)

[Brox Chen via llvm-commits]

================
@@ -64,6 +64,8 @@ class SIRegisterInfo final : public AMDGPUGenRegisterInfo {
     bool hasReg() { return VGPR != 0; }
   };
 
+  const GCNSubtarget &getSubtarget() const { return ST; }
----------------
broxigarchen wrote:

removed

https://github.com/llvm/llvm-project/pull/128927