Pull in r291403 from upstream clang trunk (by Richard Smith):

  PR30305: Implement proposed DR resolution to prevent slicing via
  inherited constructor.

  The rule we use is that a construction of a class type T from an
  argument of type U cannot use an inherited constructor if U is the
  same as T or is derived from T (or if the initialization would first
  convert it to such a type). This (approximately) matches the rule in
  use by GCC, and matches the current proposed DR resolution.

Pull in r291955 from upstream clang trunk (by Richard Smith):

  PR31606: Generalize our tentative DR resolution for inheriting
  copy/move constructors to better match the pre-P0136R1 behavior.

Together, these fix an issue with C++ using declarations sometimes
enabling illegal implicit casts.

Direct commit to stable/11, since head already has clang 4.0.0, which
includes this change.

Reported by:	kami
PR:		215969

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