Don't do sext+and optimization for generic targets
Merge pull request #698 from dbabokin/sext_and

Don't do sext+and optimization for generic targets
Checkout and install with clang standard library headers on MacOS 10.9
Bumping up 3.4 version from rc3 to final
Merge pull request #699 from dbabokin/mac_build

Mac build fix on 10.9 #688