Use inline namespaces with GCC instead of __attribute__((__strong__)). GCC 7.0.1 started warning that __attribute__((__strong__)) is depricated. This patch switches to using inline namespace with GCC instead. I believe this wasn't done originally in order to support older GCC versions w/o support for inline namespaces, or because earlier versions of GCC warned users that the STL was using an inline namespace (even though it shouldn't affect users). However I believe all of the above problems are gone for GCC 4.9 and greater. Therefore switching to using inline namespaces instead of using __strong__ is the most correct behavior. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@295428 91177308-0d34-0410-b5e6-96231b3b80d8
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