[PATCH 1/2] RISC-V: lib: Improve memset assembler formatting

[zhangfei]

From: zhangfei <zhangfei at nj.iscas.ac.cn>

Hi,

Due to the chaotic response in my previous email, I am sorry for this. I have 
reorganized patch v2 and sent it to you. Please reply under the latest patch.

Thanks,
Fei Zhang