Implementing SVE in `[SD]AXPY` Kernels for `A64FX` and `Graviton3E` #2362

Job	Run time
TEST (LOONGSON2K1000, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON2K1000)	3h 24m 15s
TEST (LA64_GENERIC, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA64_GENERIC)	17m 28s
TEST (LOONGSON3R5, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON3R5)	17m 8s
TEST (DYNAMIC_ARCH, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=GENERIC)	17m 13s
TEST (LA264, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA264)	18m 18s
TEST (LA464, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA464)	50m 42s
TEST (LOONGSONGENERIC, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSONGENERIC)	16m 25s
TEST (LOONGSON2K1000, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON2K1000)	18m 0s
TEST (LOONGSON3R5, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSON3R5)	17m 8s
TEST (LA64_GENERIC, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA64_GENERIC)	17m 28s
TEST (DYNAMIC_ARCH, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=GENERIC)	17m 13s
TEST (LA464, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA464)	50m 42s
TEST (LOONGSONGENERIC, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LOONGSONGENERIC)	16m 25s
TEST (LA264, loongarch64-linux-gnu, NO_SHARED=1 DYNAMIC_ARCH=1 TARGET=LA264)	18m 18s
	8h 16m 43s

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