re PR ada/41929 (64-bit null_pointer_deref1 gnat.dg test consumes all available memory)

re PR ada/41929 (64-bit null_pointer_deref1 gnat.dg test consumes all available memory)

	gcc:
	PR ada/41929
	* config/sparc/sol2-unwind.h: Include <sys/frame.h>, <sys/stack.h>
	(IS_SIGHANDLER): Define.
	(sparc64_is_sighandler): New function, split off from
	sparc64_fallback_frame_state.
	(sparc_is_sighandler): New function, split off from
	sparc_fallback_frame_state.
	(sparc64_fallback_frame_state): Merge with ...
	(sparc_fallback_frame_state): ... this into ...
	(MD_FALLBACK_FRAME_STATE_FOR): ... this.
	Change new_cfa to long.
	Remove regs_off, fpu_save_off, fpu_save.
	Define nframes, mctx.
	Use IS_SIGHANDLER, handler_args, mctx, walk stack instead of
	hardcoded offsets.

	gcc/testsuite:
	PR ada/41929
	* gnat.dg/null_pointer_deref1.exp: Don't skip on
	sparc*-sun-solaris2.11.

From-SVN: r170126