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

[Matt Arsenault via llvm-commits]

================
@@ -720,10 +784,14 @@ template <> struct MappingTraits<MachineFrameInfo> {
     YamlIO.mapOptional("isCalleeSavedInfoValid", MFI.IsCalleeSavedInfoValid,
                        false);
     YamlIO.mapOptional("localFrameSize", MFI.LocalFrameSize, (unsigned)0);
-    YamlIO.mapOptional("savePoint", MFI.SavePoint,
-                       StringValue()); // Don't print it out when it's empty.
-    YamlIO.mapOptional("restorePoint", MFI.RestorePoint,
-                       StringValue()); // Don't print it out when it's empty.
+    YamlIO.mapOptional(
+        "savePoint", MFI.SavePoints,
+        SaveRestorePoints(
+            StringValue())); // Don't print it out when it's empty.
----------------
arsenm wrote:

Empty list?

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