[llvm] [CodeGen] Merge lowerConstantIntrinsics into pre-isel lowering (PR #97727)

[Jay Foad via llvm-commits]

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@@ -66,6 +71,27 @@ struct PreISelIntrinsicLowering {
 
 } // namespace
 
+template <class T>
+static bool forEachCall(Function &Intrin, T Callback) {
+  // Lowering all intrinsics in a function will delete multiple uses, so we
+  // can't use an early-inc-range. In case some remain, we don't want to look
+  // at them again. Unfortunately, Value::UseList is private, so we can't use a
+  // simple Use**. If LastUse is null, we the next use to consider is
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jayfoad wrote:

```suggestion
  // simple Use**. If LastUse is null, the next use to consider is
```

https://github.com/llvm/llvm-project/pull/97727