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
+!
merged with master
added driver fuction
+1
added test
Merge branch 'sm35' of github.com:egaburov/ispc into sm35
in PTX mode, add ___export to exported function unmangled name
+1
+1
merge sm35