[SOL] Simplify code emission for syscalls #317

Job	Run time
abi-dump-setup	1m 23s
Test lld / Lit Tests (ubuntu-22.04)	1h 6m 36s
Build lldb / Lit Tests (ubuntu-22.04)	2h 6m 34s
Test llvm,clang,libclc / Lit Tests (ubuntu-22.04)	2h 54m 47s
Test lld / Lit Tests (windows-2019)	2m 9s
Build lldb / Lit Tests (windows-2019)	2m 18s
Test llvm,clang,libclc / Lit Tests (windows-2019)	2m 11s
Build lldb / Lit Tests (macOS-latest)	1h 22m 23s
Test lld / Lit Tests (macOS-latest)	44m 29s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	2h 7m 57s
abi-dump (build-baseline)	32m 28s
abi-dump (build-latest)	32m 32s
abi-compare	29s
	11h 36m 16s

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