[llvm] [CodeGen] Port AtomicExpand to new Pass Manager (PR #71220)

[Rishabh Bali via llvm-commits]

================
@@ -429,6 +429,7 @@ FUNCTION_PASS("strip-gc-relocates", StripGCRelocates())
 FUNCTION_PASS("structurizecfg", StructurizeCFGPass())
 FUNCTION_PASS("tailcallelim", TailCallElimPass())
 FUNCTION_PASS("typepromotion", TypePromotionPass(TM))
+FUNCTION_PASS("expand-atomic", ExpandAtomicPass(TM))
----------------
Ris-Bali wrote:

Will rebase the PR and make this change.

https://github.com/llvm/llvm-project/pull/71220