[llvm] [AMDGPU] Fix s_singleuse_vdst not detecing exec mask changes (PR #89401)

[Scott Egerton via llvm-commits]

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@@ -112,7 +112,7 @@ class AMDGPUInsertSingleUseVDST : public MachineFunctionPass {
 
           // Reset uses count when a register is no longer live.
           for (const MCRegUnit &Unit : RegUnits)
-            RegisterUseCount.erase(Unit);
+            RegisterUseCount[Unit] = 0;
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ScottEgerton wrote:

Okay, I do have a downstream patch for that. I'll post that first.

https://github.com/llvm/llvm-project/pull/89401