Implementing SVE in `[SD]AXPY` Kernels for `A64FX` and `Graviton3E` #6012

Job	Run time
neoverse_build	7m 45s
build (ubuntu-latest, gfortran, make)	22m 6s
msys2 (UCRT64, int32, Release)	1h 41m 47s
msys2 (UCRT64, int64, Release)	1h 39m 40s
msys2 (MINGW32, int32, Release)	14m 50s
cross_build (riscv64, riscv64-linux-gnu, TARGET=RISCV64_GENERIC)	3m 0s
build (ubuntu-latest, flang, cmake)	11m 48s
build (ubuntu-latest, flang, make)	18m 0s
build (ubuntu-latest, gfortran, cmake)	45m 22s
msys2 (CLANG64, int64, Release)	15m 52s
cross_build (mips64el, mips64el-linux-gnuabi64, DYNAMIC_ARCH=1 TARGET=GENERIC)	3m 45s
build (macos-latest, gfortran, make)	14m 19s
cross_build (mipsel, mipsel-linux-gnu, TARGET=MIPS1004K)	3m 17s
cross_build (alpha, alpha-linux-gnu, TARGET=EV4)	15m 4s
msys2 (UCRT64, int32, None, mingw-w64-ucrt-x86_64, fc)	12m 19s
build (macos-latest, gfortran, cmake)	33m 53s
msys2 (CLANG64, int32, Release)	16m 16s
	7h 19m 3s

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