gcc/

	PR target/66569
	* function.c (assign_bounds): Add arguments assign_regs,
	assign_special, assign_bt.
	(assign_parms): For vararg functions handle bounds in BT
	and special slots after incoming vararg bounds.

gcc/testsuite/

	PR target/66569
	* gcc.target/i386/mpx/chkp-vararg.c: New test.

From-SVN: r224602