[llvm] [Attributor][AMDGPU] Enable AAIndirectCallInfo for AMDAttributor (PR #100952)

[Johannes Doerfert via llvm-commits]

jdoerfert wrote:

> I moved some code from #100954 to here. I'll come up with a test case that it can't be manifested w/o close world.

```
int G;
void bar() { G = 1; }
void foo(void (*fp)()) {
  fp();
}
```
w/ closed world we know we call bar, w/o we don't.

https://github.com/llvm/llvm-project/pull/100952