target-globals.c (save_target_globals): Allocate < 4KB structs using GC in payload of target_globals struct instead of...

	* target-globals.c (save_target_globals): Allocate < 4KB structs using
	GC in payload of target_globals struct instead of allocating them on
	the heap and the larger structs separately using GC.
	* target-globals.h (struct target_globals): Make regs, hard_regs,
	reload, expmed, ira, ira_int and lra_fields GTY((atomic)) instead
	of GTY((skip)) and change type to void *.
	(reset_target_globals): Cast loads from those fields to corresponding
	types.

From-SVN: r206539