AMDGPU: Stop promoting allocas with addrspacecast users (#104051)

We cannot promote this case unless we know the value is only
observed through flat operations. We cannot analyze this through
a call. PointerMayBeCaptured was an imprecise check for this.
A callee with a nocapture attribute may still cast to private and
observe the address space, so really we need a different notion
of nocapture.

I doubt this was of any use anyway. The promotable cases should
have optimized out addrspacecast to begin earlier.

Fixes #66669
Fixes #104035

0 files changed, 0 insertions, 0 deletions