2018-12-06  Richard Biener  <rguenther@suse.de>

	* bitmap.c (bitmap_head::crashme): Define.
	* bitmap.h (bitmap_head): Add constexpr default constructor
	poisoning the obstack member.
	(bitmap_head::crashme): Declare.
	(bitmap_release): New function clearing a bitmap and poisoning
	the obstack member.
	* gengtype.c (main): Make it recognize CONSTEXPR.

	* lra-constraints.c (lra_inheritance): Use bitmap_release
	instead of bitmap_clear.

	* ira.c (ira): Work around class-memaccess warning.
	* regrename.c (create_new_chain): Likewise.

From-SVN: r266850