[AMDGPU] make AMDGPUUniformIntrinsicCombine a function pass (#165265) There has been an issue(using function analysis inside the module pass in OPM) integrating this pass into the LLC pipeline, which currently lacks NPM support. I tried finding a way to get the per-function analysis, but it seems that in OPM, we don't have that option. So the best approach would be to make it a function pass. Ref: https://github.com/llvm/llvm-project/pull/116953
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