[llvm] [InferAddressSpaces] Infer pointer stored and then loaded from global variable (PR #159755)

[Wenju He via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 6
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wenju-he wrote:

> We need some negative tests, where multiple stores to the GV, but the pointers are in different ASs.

done, thanks @shiltian 

https://github.com/llvm/llvm-project/pull/159755