[llvm] [PowerPC] Spill non-volatile registers required for traceback table (PR #71115)

[Chen Zheng via llvm-commits]

================
@@ -843,3 +843,5 @@ if.end.6:
   %cmp1.7 = icmp eq i32 %18, %conv18.i
   br i1 %cmp1.7, label %if.then, label %cleanup
 }
+
+attributes #0 = { nounwind }
----------------
chenzheng1030 wrote:

Unnecessary?

https://github.com/llvm/llvm-project/pull/71115