Optimize the rotm kernel with RVV intrinsic. #5234

Job	Run time
build (ubuntu-latest, gfortran, cmake)	42m 6s
build (ubuntu-latest, gfortran, make)	20m 11s
build (ubuntu-latest, flang, cmake)	43m 47s
build (ubuntu-latest, flang, make)	18m 41s
build (macos-latest, gfortran, cmake)	12m 50s
build (macos-latest, gfortran, make)	3m 13s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	5m 46s
msys2 (UCRT64, int32, Release)	18m 9s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	9m 54s
msys2 (UCRT64, int64, Release)	16m 56s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	5m 34s
msys2 (MINGW32, int32, Release)	19m 31s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	4m 49s
msys2 (CLANG64, int32, Release)	18m 44s
msys2 (CLANG64, int64, Release)	18m 58s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	14m 31s
	4h 33m 40s

Provide feedback