riscv64: Move rev8 instruction to ISLE
#7319
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afonso360
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Oct 21, 2023
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👋 Hey,
We currently have two implementations of this instruction. One used in
bswapand a second one used only inbitrev. They are somewhat different, thebitrevversion uses a loop, and thebswapone is just straight-line sequence of instructions.This PR normalizes on the
bswapversion, and deletes the loop version from the backend.