[SOL] Implement syscall instruction #314

Job	Run time
abi-dump-setup	1m 23s
Test lld / Lit Tests (ubuntu-22.04)	10m 53s
Test lld / Lit Tests (windows-2019)	2m 12s
Build lldb / Lit Tests (ubuntu-22.04)	25m 45s
Test lld / Lit Tests (macOS-latest)	11m 29s
Build lldb / Lit Tests (windows-2019)	1m 51s
Build lldb / Lit Tests (macOS-latest)	15m 6s
Test llvm,clang,libclc / Lit Tests (ubuntu-22.04)	47m 5s
Test llvm,clang,libclc / Lit Tests (windows-2019)	1m 57s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	59m 17s
abi-dump (build-baseline)	33m 4s
abi-dump (build-latest)	32m 16s
abi-compare	30s
	4h 2m 48s

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