parser.c (cp_parser_member_declaration): Parse attributes before colon of a bitfield in addition to after colon.

cp/
	* parser.c (cp_parser_member_declaration): Parse attributes before
	colon of a bitfield in addition to after colon.
testsuite/
	* g++.dg/ext/bitfield7.C: New test.
	* g++.dg/ext/bitfield8.C: New test.
	* g++.dg/ext/bitfield9.C: New test.

From-SVN: r253281