compiler_rt: add __bswapsi2, __bswapdi2 and __bswapti2
- each byte gets masked, shifted and combined
- use boring masks instead of comptime for readability
- tests: bit patterns with reverse operation, if applicable
See #1290
efdb94486bJan Philipp Hafer committed on 12/11/2021, 9:43:37 AM· committed by Andrew Kelleyparent97c0373