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

[Philip Reames via llvm-commits]

================
@@ -86,8 +86,8 @@ frameInfo:
   hasMustTailInVarArgFunc: false
   hasTailCall:     false
   localFrameSize:  0
-  savePoint:       ''
-  restorePoint:    ''
+  savePoints:      []
----------------
preames wrote:

You will cut out a huge amount of spurious diff if you teach the parser to support both the singular and plural forms here.  

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