Separate ARM and ARM SVE tags and add SVE2 detectors #23

Job	Run time
msvc (Debug)	37s
msvc (Release)	1m 6s
clang-cl (Debug)	1m 17s
clang (clang, x86, Debug)	1m 51s
gcc (gcc, x86, Debug)	1m 56s
clang-cl (Release)	1m 19s
clang (clang, x86, Release)	1m 51s
gcc (gcc, x86, Release)	1m 50s
gcc (gcc, aarch64, -Wno-psabi, Debug)	1m 46s
macosx (clang, x86_osx, Debug)	30s
gcc (gcc, aarch64, -Wno-psabi, Release)	1m 49s
wasm (clang, wasm, Debug)	1m 56s
macosx (clang, x86_osx, Release)	35s
gcc (gcc, aarch64.sve, -Wno-psabi, Debug)	1m 51s
wasm (clang, wasm, Release)	2m 12s
gcc (gcc, aarch64.sve, -Wno-psabi, Release)	1m 48s
macosx (gcc, x86_osx, Debug)	24s
macosx (gcc, x86_osx, Release)	19s
gcc (gcc, aarch64.sve2, -Wno-psabi, Debug)	1m 45s
gcc (gcc, aarch64.sve2, -Wno-psabi, Release)	1m 49s
gcc (gcc, ppc64, -Wno-psabi, Debug)	1m 51s
gcc (gcc, ppc64, -Wno-psabi, Release)	1m 48s
	32m 10s

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