re PR debug/40462 (ICE in dwarf2out_begin_epilogue, at dwarf2out.c:2773 while compiling mlib-tgt.adb)

	PR debug/40462
	* jump.c (returnjump_p): Revert last patch.
	* dwarf2out.c (dwarf2out_begin_epilogue): Handle SEQUENCEs.

From-SVN: r149150