* call.c (convert_class_to_reference): Binding an lvalue to an
rvalue reference is bad. If the user-defined conversion is bad,
set bad_p before merging conversions.
(maybe_handle_ref_bind): Don't push down bad_p.
(reference_binding): Binding an lvalue to an rvalue reference is bad.
(convert_like_real): Give a helpful error about binding lvalue
to rvalue reference.
(reference_related_p): No longer static.
* typeck.c (build_typed_address): New.
(build_static_cast_1): Add static_cast from lvalue to &&.
* cp-tree.h: Adjust.
* include/bits/move.h (forward): Implement as in N2835.
(move): Implement as in N2831.
* include/std/istream (rvalue stream operator>>): New.
* include/std/ostream (rvalue stream operator<<): New.
Co-Authored-By: Douglas Gregor <doug.gregor@gmail.com>
From-SVN: r150327
