riscv: kprobes: simulate c.jr and c.jalr instructions

kprobes currently rejects c.jr and c.jalr instructions. Implement them.

Signed-off-by: Nam Cao <namcaov@gmail.com>
Reviewed-by: Charlie Jenkins <charlie@rivosinc.com>
Link: https://lore.kernel.org/r/db8b7787e9208654cca50484f68334f412be2ea9.1690704360.git.namcaov@gmail.com


Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>