[llvm] AMDGPU/GlobalISel: Add regbanklegalize rules for uniform global loads (PR #145909)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
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arsenm wrote:

Test name could be more specific, it's uniform VGPR loads. 

https://github.com/llvm/llvm-project/pull/145909