There is still some Mountain Lion related settings in ANGLE's Base.xcconfig, and it is causing problems
when trying to build with ASan enabled. We should remove it.
Created attachment 266292 [details]
Patch removes TOOLCHAIN settings from the Base.xcconfig file. The only reason these existed was for Mountain Lion support.
Note that there are important steps to take when updating ANGLE. See http://trac.webkit.org/wiki/UpdatingANGLE