[llvm] [LLVM] Slay undead copysign code (PR #111269)

[Matt Arsenault via llvm-commits]

================
@@ -71,12 +74,12 @@ entry:
   %call = tail call ppc_fp128 @copysignl(ppc_fp128 %conv, ppc_fp128 %conv1) #0
   ret ppc_fp128 %call
 
-; CHECK-LABEL: @foo_lf
-; CHECK: bl copysignl
-; CHECK: blr
+; CHECK-LABEL:     @foo_lf
+; CHECK-NOT:         bl copysignl
----------------
arsenm wrote:

-NOT checks are fragile, use positive checks for what is emitted 

https://github.com/llvm/llvm-project/pull/111269