[llvm] [InstCombine] Propagate poison pow[i] (PR #146750)

[Luke Lau via llvm-commits]

================
@@ -44,3 +44,33 @@ define void @powi_i16(float %V, ptr%P) {
 
   ret void
 }
+
+define void @pow_poison_i16(i16 %arg_int,float %arg_flt, ptr %P) {
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lukel97 wrote:

```suggestion
define void @pow_poison(i16 %int, float %flt, ptr %P) {
```

https://github.com/llvm/llvm-project/pull/146750