Added bit manipulation reference code from https://github.com/riscv/riscv-bitmanip.git; approved in CQ 23398 (!120) · Merge requests · OpenHW Group / backup-20241120 / cv32e40x

Created by: Silabs-ArjanB

Added bit manipulation reference code (approved for addition in CQ 23398) Signed-off-by: Arjan Bink Arjan.Bink@silabs.com

Added bit manipulation reference code from https://github.com/riscv/riscv-bitmanip.git; approved in CQ 23398