[llvm] [NFC][AMDGPU] Remove `-verify-machineinstrs` from `llvm/test/CodeGen/MIR/AMDGPU/` (PR #150046)

[Matt Arsenault via llvm-commits]

arsenm wrote:

llc should run the verifier on all mir inputs, and on the final output for all MIR tests always, but I'm not 100% sure it actually does 

https://github.com/llvm/llvm-project/pull/150046