Merge pull request #5239 from annop-w/gemv_n_sve #5601

Job	Run time
msys2 (UCRT64, int32, Release)	14m 39s
msys2 (UCRT64, int64, Release)	14m 4s
msys2 (CLANG64, int32, Release)	15m 11s
build (ubuntu-latest, flang, cmake)	9m 56s
build (ubuntu-latest, gfortran, cmake)	44m 59s
msys2 (CLANG64, int64, Release)	16m 50s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	13m 35s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 28s
build (macos-latest, gfortran, cmake)	31m 54s
build (ubuntu-latest, flang, make)	4m 52s
neoverse_build	7m 48s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	2m 38s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	2m 35s
build (ubuntu-latest, gfortran, make)	21m 11s
msys2 (MINGW32, int32, Release)	17m 34s
build (macos-latest, gfortran, make)	4m 1s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	3m 22s
	3h 48m 37s

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