Reverted previous fix to is_convertible as it caused more problems than it fixed.  But this reverted fix will only matter for non-clang compilers.  Installed __is_convertible_to for clang.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@124429 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed