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Like we do in libc++, PSTL needs the ability to constrain ABI-unstable symbols to each translation unit. This is OFF by default (like for libc++), because most people don't care about this and there is a cost associated to enabling the option (code bloat because templates are not deduped across TUs). I'm using '#pragma clang attribute push' to avoid marking each declaration with an attribute, which quickly becomes difficult to maintain. llvm-svn: 368684