[llvm] [llvm] Support multiple save/restore points in mir (PR #119357)

[Michael Maitland via llvm-commits]

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@@ -27,6 +27,21 @@ class MachineBasicBlock;
 class BitVector;
 class AllocaInst;
 
+using SaveRestorePoints = DenseMap<MachineBasicBlock *, std::vector<Register>>;
+
+class CalleeSavedInfoPerBB {
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michaelmaitland wrote:

This class is almost the same as SaveRestorePoints with some extra helper functions? Maybe we could combine the two?

https://github.com/llvm/llvm-project/pull/119357