[NVPTX] Stop using 16-bit CAS instructions from PTX (#120220) Increases minimum CAS size from 16 bit to 32 bit, for better SASS codegen. When atomics are emulated using atom.cas.b16, the SASS generated includes 2 (nested) emulation loops. When emulated using an atom.cas.b32 loop, the SASS too has a single emulation loop. Using 32 bit CAS thus results in better codegen.
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