Optimize the cvCeil and cvFloor functions.
Optimize the cvCeil and cvFloor functions.

This patch optimizes the cvCeil and cvFloor functions on
the LoongArch platform.

Signed-off-by: Hao Chen <7d81e2ac2fd274bbe80d9d0ae9d2d6312b3cf0d4@loongson.cn>

opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv,opencv/opencv