Revert "generate_jit: Refactor to deduplicate custom call generation"
Revert "generate_jit: Refactor to deduplicate custom call generation"

This reverts commit fcbaea9cc989961adffa64b30afcde9579dcaab0.

copy/v86,copy/v86,copy/v86,copy/v86,copy/v86,copy/v86,copy/v86