[llvm] [AMDGPU] Fix soft clause hazards missed past the lookahead window (PR #220806)

[Matt Arsenault via llvm-commits]

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@@ -1178,11 +1193,11 @@ int GCNHazardRecognizer::checkSoftClauseHazards(MachineInstr *MEM) const {
   if (MEM->mayStore())
     return 1;
 
-  addClauseInst(*MEM);
-
   // If the set of defs and uses intersect then we cannot add this instruction
   // to the clause, so we have a hazard.
-  return ClauseDefs.anyCommon(ClauseUses) ? 1 : 0;
+  BitVector Defs = ClauseDefs, Uses = ClauseUses;
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arsenm wrote:

These bit vectors are big, can we avoid adding new copies of them 

https://github.com/llvm/llvm-project/pull/220806