[llvm] [CGP] Despeculate ctlz/cttz with "illegal" integer types (PR #137197)

[Phoebe Wang via llvm-commits]

================
@@ -285,30 +285,35 @@ define i32 @ctlo_i32_undef(i32 %x) {
   ret i32 %tmp2
 }
 
-define i64 @ctlo_i64(i64 %x) {
+define i64 @ctlo_i64(i64 %x) nounwind {
 ; X86-NOCMOV-LABEL: ctlo_i64:
 ; X86-NOCMOV:       # %bb.0:
+; X86-NOCMOV-NEXT:    pushl %esi
----------------
phoebewang wrote:

How about a i128 on a 64-bit platform?

https://github.com/llvm/llvm-project/pull/137197