[llvm] [InferAddressSpaces] Initialize op(uninit const, uninit const, ...) -> flat (PR #172143)

[Wenju He via llvm-commits]

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wenju-he wrote:

Not quite related to this PR, but there is still opportunity to infer AS from ConstantPtrOps if any of them's AS is already inferred, right?

https://github.com/llvm/llvm-project/pull/172143