Revert "AMDGPU/GlobalISel: Add stub custom regbankselect pass" (#113913) This reverts commit e9c49901a43f5b16c3df416460b7e4dbdd24ce03. Current AMDGPURegBankSelect does nothing different then RegBankSelect. Revert to using generic RegBankSelect in preparation for adding new regbankselect passes. New AMDGPURegBankSelect, that will use uniformity analysis for regbank select decisions, will not subclass RegBankSelect. Revert regression tests to use regbankselect since amdgpu-regbankselect will be used by new pass and behavior will be different.
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