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
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