Fix lookup of initialized captures in unevaluated context.

Fix lookup of initialized captures in unevaluated context.

	* cp-tree.h (DECL_NORMAL_CAPTURE_P): New.
	* name-lookup.c (qualify_lookup): Check it.
	* parser.c (cp_parser_lambda_introducer): Pass explicit_init_p
	to add_capture.
	* semantics.c (add_capture): Set DECL_NORMAL_CAPTURE_P
	on captures without explicit init.
	(add_default_capture): Pass explicit_init_p.

	Fix capture by copy of types with explicit copy constructor.
	* cp-tree.h (TARGET_EXPR_DIRECT_INIT_P): New.
	(DIRECT_INIT_EXPR_P): New.
	* typeck.c (convert_for_initialization): Just return if
	DIRECT_INIT_EXPR_P.
	* parser.c (cp_parser_lambda_introducer): Use
	TARGET_EXPR_DIRECT_INIT_P for normal captures.

From-SVN: r152500