Temporary change for experimental purposes. Further cleanups will
be needed if this sheme works as we hope.

2018-05-30  Olivier Hainque  <hainque@adacore.com>

gcc/ada/

	* vx_crtbegin_attr.c (CTOR_ATTRIBUTE, DTOR_ATTRIBUTE): Empty.
	(eh_registration_ctors, eh_registration_tors): New static variables,
	forced in a .ctors/.dtors section, respectively, with priority.

From-SVN: r260938