[llvm] [Attributor] Fix an issue that an access is skipped by mistake (PR #101862)

[Shilei Tian via llvm-commits]

shiltian wrote:

> Testcase?

Well, the thing is, this can only be exposed in an Attributor use that doesn't have `AAInterFnReachability`. Regular `AttributorPass` will not have this issue. Only `AMDGPUAttributorPass` can do this, but the enabling of `AAIndirectCallInfo ` has been reverted so even that can't expose it.

https://github.com/llvm/llvm-project/pull/101862