[AMDGPU] Remove unsound dependency on ISA version in waitcnt

llvm/lib/Target/AMDGPU/SIInsertWaitcnts.cpp

bool SIInsertWaitcnts::generateWaitcntInstBefore(
   }
 
   // All waits must be resolved at call return.
   // NOTE: this could be improved with knowledge of all call sites or
   //   with knowledge of the called routines.
   if (MI.getOpcode() == AMDGPU::SI_RETURN_TO_EPILOG ||
       MI.getOpcode() == AMDGPU::S_SETPC_B64_return ||
       (MI.isReturn() && MI.isCall() && !callWaitsOnFunctionEntry(MI))) {
-    Wait = Wait.combined(AMDGPU::Waitcnt::allZero(IV));
+    Wait = Wait.combined(AMDGPU::Waitcnt::allZero(ST->hasVscnt()));
   }
   // Resolve vm waits before gs-done.
   else if ((MI.getOpcode() == AMDGPU::S_SENDMSG ||
             MI.getOpcode() == AMDGPU::S_SENDMSGHALT) &&
            ((MI.getOperand(0).getImm() & AMDGPU::SendMsg::ID_MASK_) ==
             AMDGPU::SendMsg::ID_GS_DONE)) {
     Wait.VmCnt = 0;
   }
#endif
   }
 
   // Check to see if this is an S_BARRIER, and if an implicit S_WAITCNT 0
   // occurs before the instruction. Doing it here prevents any additional
   // S_WAITCNTs from being emitted if the instruction was marked as
   // requiring a WAITCNT beforehand.
   if (MI.getOpcode() == AMDGPU::S_BARRIER &&
       !ST->hasAutoWaitcntBeforeBarrier()) {
-    Wait = Wait.combined(AMDGPU::Waitcnt::allZero(IV));
+    Wait = Wait.combined(AMDGPU::Waitcnt::allZero(ST->hasVscnt()));
   }
 
   // TODO: Remove this work-around, enable the assert for Bug 457939
   //       after fixing the scheduler. Also, the Shader Compiler code is
   //       independent of target.
   if (readsVCCZ(MI) && ST->hasReadVCCZBug()) {
     if (ScoreBrackets.getScoreLB(LGKM_CNT) <
             ScoreBrackets.getScoreUB(LGKM_CNT) &&
if (OldWaitcntInstr) {
           ScoreBrackets.applyWaitcnt(AMDGPU::Waitcnt(~0u, ~0u, ~0u, W));
         }
       }
     }
     return Modified;
   }
 
   if (ForceEmitZeroWaitcnts)
-    Wait = AMDGPU::Waitcnt::allZero(IV);
+    Wait = AMDGPU::Waitcnt::allZero(ST->hasVscnt());
 
   if (ForceEmitWaitcnt[VM_CNT])
     Wait.VmCnt = 0;
   if (ForceEmitWaitcnt[EXP_CNT])
     Wait.ExpCnt = 0;
   if (ForceEmitWaitcnt[LGKM_CNT])
     Wait.LgkmCnt = 0;
   if (ForceEmitWaitcnt[VS_CNT])
if (ST->vmemWriteNeedsExpWaitcnt() &&
         (Inst.mayStore() || AMDGPU::getAtomicNoRetOp(Inst.getOpcode()) != -1)) {
       ScoreBrackets->updateByEvent(TII, TRI, MRI, VMW_GPR_LOCK, Inst);
     }
   } else if (TII->isSMRD(Inst)) {
     ScoreBrackets->updateByEvent(TII, TRI, MRI, SMEM_ACCESS, Inst);
   } else if (Inst.isCall()) {
     if (callWaitsOnFunctionReturn(Inst)) {
       // Act as a wait on everything
-      ScoreBrackets->applyWaitcnt(AMDGPU::Waitcnt::allZero(IV));
+      ScoreBrackets->applyWaitcnt(AMDGPU::Waitcnt::allZero(ST->hasVscnt()));
     } else {
       // May need to way wait for anything.
       ScoreBrackets->applyWaitcnt(AMDGPU::Waitcnt());
     }
   } else {
     switch (Inst.getOpcode()) {
     case AMDGPU::S_SENDMSG:
     case AMDGPU::S_SENDMSGHALT:

llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.h

struct Waitcnt {
   unsigned ExpCnt = ~0u;
   unsigned LgkmCnt = ~0u;
   unsigned VsCnt = ~0u;
 
   Waitcnt() {}
   Waitcnt(unsigned VmCnt, unsigned ExpCnt, unsigned LgkmCnt, unsigned VsCnt)
       : VmCnt(VmCnt), ExpCnt(ExpCnt), LgkmCnt(LgkmCnt), VsCnt(VsCnt) {}
 
-  static Waitcnt allZero(const IsaVersion &Version) {
-    return Waitcnt(0, 0, 0, Version.Major >= 10 ? 0 : ~0u);
+  static Waitcnt allZero(bool HasVscnt) {
+    return Waitcnt(0, 0, 0, HasVscnt ? 0 : ~0u);
   }
   static Waitcnt allZeroExceptVsCnt() { return Waitcnt(0, 0, 0, ~0u); }
 
   bool hasWait() const {
     return VmCnt != ~0u || ExpCnt != ~0u || LgkmCnt != ~0u || VsCnt != ~0u;
   }
 
   bool dominates(const Waitcnt &Other) const {