target/riscv: Ignore the pc bits above XLEN

target/riscv: Ignore the pc bits above XLEN

The read from PC for translation is in cpu_get_tb_cpu_state, before translation.

Signed-off-by: LIU Zhiwei <zhiwei_liu@c-sky.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Message-id: 20220120122050.41546-7-zhiwei_liu@c-sky.com
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>