Merge pull request #695 from jbrodman/master

Add missing __cast_sext(__vec16_i32,__vec16_i1)
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
Adding Alias Analysis phases
correction of checking tools in testing environment
Merge pull request #700 from ifilippov/alloy

Correction of checking tools in testing environment
Adding some optimization passes between two Alias Analysis passes
Merge pull request #701 from ifilippov/alias_new

Adding Alias Analysis passes