[RFC] arch: custom `_current` implementation - alt#81153

ycsin wants to merge 2 commits intozephyrproject-rtos:mainzephyrproject-rtos/zephyr:mainfrom

ycsin:pr/riscv-thread-in-gp-altycsin/zephyr:pr/riscv-thread-in-gp-altCopy head branch name to clipboard