Apply patches supplied by Michel Morin in http://llvm.org/bugs/show_bug.cgi?id=13601 to correct bugs in is_convertible for the case that the intrinsic __is_convertible_to is not available.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@162111 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed