[llvm] [AMDGPU] Fix GCNUpwardRPTracker: max register pressure on defs. (PR #74422)

[Valery Pykhtin via llvm-commits]

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@@ -274,32 +274,42 @@ void GCNUpwardRPTracker::recede(const MachineInstr &MI) {
   if (MI.isDebugInstr())
     return;
 
-  auto DecrementDef = [this](const MachineOperand &MO) {
+  // Kill all defs.
+  GCNRegPressure DefPressure, ECDefPressure;
+  bool HasECDefs = false;
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vpykhtin wrote:

Right, I decided to add it because early-clobbers are rare.

https://github.com/llvm/llvm-project/pull/74422