Upgrade to llvm 17 #21

Job	Run time
i686-pc-windows-msvc/msvc (Debug)	4m 34s
i686-pc-windows-msvc/msvc (Release)	3m 17s
x86_64-pc-windows-msvc/msvc (Debug)	2m 46s
x86_64-pc-windows-msvc/msvc (Release)	3m 58s
aarch64-pc-windows-msvc/msvc (Debug)	3m 18s
aarch64-pc-windows-msvc/msvc (Release)	2m 48s
x86_64-apple-darwin/clang (Debug)	3m 50s
x86_64-apple-darwin/clang (Release)	3m 24s
aarch64-apple-darwin/clang (Debug)	2m 12s
aarch64-apple-darwin/clang (Release)	2m 12s
x86_64-unknown-linux-gnu/gcc (Debug)	1m 29s
x86_64-unknown-linux-gnu/gcc (Release)	2m 3s
x86_64-unknown-linux-gnu/clang (Debug)	1m 48s
x86_64-unknown-linux-gnu/clang (Release)	1m 41s
aarch64-unknown-linux-gnu/gcc (Debug)	3m 30s
aarch64-unknown-linux-gnu/gcc (Release)	4m 27s
aarch64-unknown-linux-gnu/clang (Debug)	4m 4s
aarch64-unknown-linux-gnu/clang (Release)	6m 46s
	58m 7s

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