LLVM: Decrease max opt level used under OSX to avoid bug
Currently, many programs compiled with GHC at -O2 and LLVM set to -O3 will segfault (only under OSX). Until this issue is fixed I have simply 'solved' the segfault by lowering the max opt level for LLVM used to -O2 under OSX. All these recent changes to OSX should mean its finally as stable as Linux and Windows.
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