[llvm] [PPC] Add custom lowering for uaddo (PR #110137)

[Maryam Moghadas via llvm-commits]

================
@@ -0,0 +1,37 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=powerpc-unknown-linux-gnu | FileCheck %s
----------------
maryammo wrote:

Is the AIX assembly exactly the same? Can we add a RUN line for AIX?

https://github.com/llvm/llvm-project/pull/110137