[compiler-rt] [lldb] [libc] [lld] [flang] [clang-tools-extra] [libcxx] [clang] [llvm] [AMDGPU] Use alias info to relax waitcounts for LDS DMA (PR #74537)

[Matt Arsenault via cfe-commits]

================
@@ -1183,9 +1228,21 @@ bool 
SIInsertWaitcnts::generateWaitcntInstBefore(MachineInstr &MI,
         // No need to wait before load from VMEM to LDS.
         if (TII->mayWriteLDSThroughDMA(MI))
           continue;
-        unsigned RegNo = SQ_MAX_PGM_VGPRS + EXTRA_VGPR_LDS;
+
         // VM_CNT is only relevant to vgpr or LDS.
-        ScoreBrackets.determineWait(VM_CNT, RegNo, Wait);
+        unsigned RegNo = SQ_MAX_PGM_VGPRS + EXTRA_VGPR_LDS;
+        bool FoundAliasingStore = false;
+        if (Ptr && Memop->getAAInfo() && Memop->getAAInfo().Scope) {
----------------
arsenm wrote:

I still don't understand the usage of scope; scope isn't special, isn't common 
and I do at all like specially treating it. I think you should just let the AA 
query figure out what to do with it 

https://github.com/llvm/llvm-project/pull/74537
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