qemu/host-utils.h: Add clz and ctz functions for lower-bit integers

This is for use in the RISC-V vclz and vctz instructions (implemented in
proceeding commit).

Signed-off-by: Kiran Ostrolenk <kiran.ostrolenk@codethink.co.uk>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230428144757.57530-11-lawrence.hunter@codethink.co.uk>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
1 file changed