AMDGPU/GlobalISel: Use AMDGPURegBankSelect + AMDGPURegBankLegalize by default (#203928) AMDGPU/GlobalISel: Use AMDGPURegBankSelect + AMDGPURegBankLegalize by default Change AMDGPU's default -global-isel pipeline to use AMDGPURegBankSelect and AMDGPURegBankLegalize (previously -global-isel -new-reg-bank-select) by default instead of RegBankSelect which uses AMDGPURegisterBankInfo. -global-isel pipeline that used RegBankSelect/AMDGPURegisterBankInfo is now deprecated, since it could not generate functionally correct code in some cases involving divergent control flow and phis. -new-reg-bank-select option does nothing and will be removed in followup patch. Delete regbankselect-mui.ll and regbankselect-mui-salu-float.ll, which existed to compare the -global-isel vs -global-isel -new-reg-bank-select. Temporarily disable a couple of tests that are missing AMDGPURegBankLegalize support.
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