[llvm] [Inliner] Fix bug where attributes are propagated incorrectly (PR #109347)

[via llvm-commits]

================
@@ -1477,6 +1483,12 @@ static void AddReturnAttributes(CallBase &CB, ValueToValueMapTy &VMap) {
     auto *NewRetVal = dyn_cast_or_null<CallBase>(VMap.lookup(RetVal));
     if (!NewRetVal)
       continue;
+
+    // The RetVal might have be simplified during the inlining
+    // process. Only propagate return attributes if we are in fact calling the
+    // same function.
+    if (RetVal->getCalledFunction() != NewRetVal->getCalledFunction())
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goldsteinn wrote:

You are worried about something like:
```
declare ptr @foo(ptr) memory(none) willreturn nounwind

define ptr @caller(ptr %p, i1 %c) {
  %r = call ptr @callee(ptr %p, i1 %c)
  ret ptr %r
}

define ptr @callee(ptr %p, i1 %c) {
  %x = call ptr @foo(ptr %p)
  br i1 %c, label %T, label %F
T:
  ret ptr %x
F:
  %r2 = call nonnull ptr @foo(ptr %p)
  ret ptr %r2
}
```
?

Where we might prop the `nonnull` from the second call to the first call if it got simplified?

https://github.com/llvm/llvm-project/pull/109347