[llvm] [AMDGPU] Use alias info to relax waitcounts for LDS DMA (PR #74537)

[Matt Arsenault via llvm-commits]

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@@ -292,6 +298,10 @@ class WaitcntBrackets {
     VgprVmemTypes[GprNo] = 0;
   }
 
+  const SmallVectorImpl<const MachineInstr *> &getLDSDMAStores() const {
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arsenm wrote:

Can this return ArrayRef?

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