Make a helper routine __throw_future_error, and encapsulate the #ifdef _LIBCPP_NO_EXCEPTIONS there, instead of duplicating it throughout the code. No functionality change

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@246772 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed