[SOL] Add return instructions for functions that end with unreachable… #332

Job	Run time
abi-dump-setup	1m 22s
Build lldb / Lit Tests (ubuntu-22.04)	24m 54s
Build lldb / Lit Tests (windows-2019)	2m 9s
Test llvm,clang,libclc / Lit Tests (ubuntu-22.04)	46m 12s
Build lldb / Lit Tests (macOS-latest)	15m 24s
Test llvm,clang,libclc / Lit Tests (windows-2019)	2m 10s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	53m 8s
Test lld / Lit Tests (ubuntu-22.04)	10m 5s
Test lld / Lit Tests (windows-2019)	1m 51s
Test lld / Lit Tests (macOS-latest)	8m 46s
abi-dump (build-baseline)	31m 24s
abi-dump (build-latest)	32m 57s
abi-compare	46s
	3h 51m 8s

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