Fix PR c++/69736

gcc/cp/ChangeLog:

	PR c++/69736
	* cp-tree.h (REF_PARENTHESIZED_P): Adjust documentation.
	(maybe_undo_parenthesized_ref): Declare.
	* semantics.c (maybe_undo_parenthesized_ref): Split out from
	check_return_expr.
	(finish_call_expr): Use it.
	* typeck.c (check_return_expr): Use it.
	* pt.c (tsubst_copy_and_build) [INDIRECT_REF]: Retain the
	REF_PARENTHESIZED_P flag.

gcc/testsuite/ChangeLog:

	PR c++/69736
	* g++.dg/cpp1y/paren2.C: New test.

From-SVN: r233691