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Add unratified Svadu extension specified in:
https://github.com/riscv/riscv-svadu/blob/main/svadu.adoc
As for testing, I modified the dirty test from https://github.com/riscv-software-src/riscv-tests. The new 64-bit test passes however the added 32-bit test fails due to rems-project/linksem#27