[SOL] Expand mulh for 32-bit #326

Job	Run time
abi-dump-setup	1m 21s
Build lldb / Lit Tests (ubuntu-22.04)	2h 5m 37s
Test llvm,clang,libclc / Lit Tests (ubuntu-22.04)	2h 58m 57s
Build lldb / Lit Tests (windows-2019)	2m 10s
Test llvm,clang,libclc / Lit Tests (windows-2019)	2m 8s
Build lldb / Lit Tests (macOS-latest)	1h 17m 18s
Test llvm,clang,libclc / Lit Tests (macOS-latest)	2h 6m 6s
Test lld / Lit Tests (ubuntu-22.04)	1h 8m 5s
Test lld / Lit Tests (windows-2019)	2m 26s
Test lld / Lit Tests (macOS-latest)	46m 25s
abi-dump (build-baseline)	31m 52s
abi-dump (build-latest)	30m 32s
abi-compare	57s
	11h 33m 54s

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