LoongArch64 Support #67

Job	Run time
ci (tpb, ubuntu-22.04, --pb --threads --enable-libffi, test-some-fast)	31m 53s
ci (a6osx, macos-12)	21m 16s
ci (ta6osx, macos-12)	27m 25s
ci (i3le, ubuntu-22.04)	13m 2s
ci (ti3le, ubuntu-22.04)	16m 0s
ci (a6le, ubuntu-22.04)	10m 20s
ci (ta6le, ubuntu-22.04)	13m 30s
ci (ta6le, ubuntu-22.04, reboot, -m=ta6le --force, re.boot SCHEME="chezscheme", test-some-fast)	17m 53s
ci (i3nt, windows-2022, vs)	21m 16s
ci (ti3nt, windows-2022, vs)	25m 4s
ci (a6nt, windows-2022, vs)	18m 5s
ci (ta6nt, windows-2022, vs)	16m 2s
ci (ta6nt, windows-2022, gcc)	13m 27s
	4h 5m 13s

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