The commit r300140 changed the implementation of compressed_pair, but didn't add
_LIBCPP_INLINE_VISIBILITY to the constructors and get members of the
compressed_pair_elem class. This patch adds the visibility annotation.
I didn't find a way to test this change with libc++ regression tests.
rdar://35352579
Differential Revision: https://reviews.llvm.org/D39751
llvm-svn: 317816