[llvm] [PowerPC] Do not rely on MachineSink threshold to optimize CR spilling (PR #128745)

[Min-Yih Hsu via llvm-commits]

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@@ -165,7 +165,7 @@ class TargetInstrInfo : public MCInstrInfo {
 
   /// For a "cheap" instruction which doesn't enable additional sinking,
   /// should MachineSink break a critical edge to sink it anyways?
-  virtual bool shouldBreakCriticalEdgeToSink(MachineInstr &MI) const {
+  virtual bool shouldBreakCriticalEdgeToSink(const MachineInstr &MI) const {
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mshockwave wrote:

nit: please don't touch unrelated part. This patch doesn't touch the users of shouldBreakCriticalEdgeToSink so adding const qualifier should be unrelated.

https://github.com/llvm/llvm-project/pull/128745