[libc++] Fix link error with _LIBCPP_HIDE_FROM_ABI_PER_TU and std::string

This is effectively a revert of r344616, which was a partial fix for
PR38964 (compilation of <string> with GCC in C++03 mode). However, that
configuration is explicitly not supported anymore and that partial fix
breaks compilation with Clang when per-TU insulation is provided.


Reviewers: mclow.lists, EricWF

Subscribers: christof, jkorous, dexonsmith, libcxx-commits

Tags: #libc

Differential Revision: https://reviews.llvm.org/D64941

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@366567 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed