[llvm] [MachineCombiner] Don't count debug instructions in block size (PR #225765)

[via llvm-commits]

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@@ -632,7 +632,7 @@ bool MachineCombinerImpl::combineInstructions(MachineBasicBlock *MBB) {
       if (DoRegPressureReduce &&
           getCombinerObjective(P) ==
               CombinerObjective::MustReduceRegisterPressure) {
-        if (MBB->size() > inc_threshold) {
+        if (MBB->sizeWithoutDebugLargerThan(inc_threshold)) {
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pzhengqc wrote:

nit: IIRC, `DoRegPressureReduce` is false for aarch64 target. So, an aarch64 test won't be able to exercise this part of the patch.

https://github.com/llvm/llvm-project/pull/225765