[llvm] [AMPGPU] Emit s_singleuse_vdst instructions when a register is used multiple times in the same instruction. (PR #89601)

[Matt Arsenault via llvm-commits]

================
@@ -114,6 +102,22 @@ class AMDGPUInsertSingleUseVDST : public MachineFunctionPass {
           for (const MCRegUnit &Unit : RegUnits)
             RegisterUseCount.erase(Unit);
         }
+
+        for (const auto &Operand : MI.all_uses()) {
----------------
arsenm wrote:

What happens with regmask operands? What happens with call uses? 

https://github.com/llvm/llvm-project/pull/89601