Update Amaranth to just before RFC 27

kuznia-rdzeni / coreblocks

RISC-V out-of-order core for education and research purposes

https://kuznia-rdzeni.github.io/coreblocks/

BSD 3-Clause "New" or "Revised" License

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Update Amaranth to just before RFC 27 #732

Closed tilk closed 1 month ago

tilk commented 1 month ago

This small PR adds support for Amaranth RFCs 42 and 46. The next commit in Amaranth implements RFC 27, which involves Settle in testbenches. I expect trouble, so I would like to work on that in a separate PR.