PR debug/29609
	PR debug/36690
	PR debug/37616
	* basic-block.h (struct edge_def): Add goto_block field.
	* cfglayout.c (fixup_reorder_chain): Ensure that there is at least
	one insn with locus corresponding to edge's goto_locus if !optimize.
	* profile.c (branch_prob): Copy edge's goto_block.
	* cfgrtl.c (force_nonfallthru_and_redirect): Use goto_locus for
	emitted jumps.
	(cfg_layout_merge_blocks): Emit a nop with edge's goto_locus
	locator in between the merged basic blocks if !optimize and needed.
	* cfgexpand.c (expand_gimple_cond): Convert goto_block and
	goto_locus into RTL locator.  For unconditional jump use that
	locator for the jump insn.
	(expand_gimple_cond): Convert goto_block and goto_locus into
	RTL locator for all remaining edges.  For unconditional jump
	use that locator for the jump insn.
	* cfgcleanup.c (try_forward_edges): Avoid the optimization if
	there is more than one edge or insn locator along the forwarding
	edges and !optimize.  If there is just one, set e->goto_locus.
	* tree-cfg.c (make_cond_expr_edges, make_goto_expr_edges): Set also
	edge's goto_block.
	(move_block_to_fn): Adjust edge's goto_block.

	* gcc.dg/debug/pr29609-1.c: New test.
	* gcc.dg/debug/pr29609-2.c: New test.
	* gcc.dg/debug/pr36690-1.c: New test.
	* gcc.dg/debug/pr36690-2.c: New test.
	* gcc.dg/debug/pr36690-3.c: New test.
	* gcc.dg/debug/pr37616.c: New test.
	* gcc.dg/debug/dwarf2/pr29609-1.c: New test.
	* gcc.dg/debug/dwarf2/pr29609-2.c: New test.
	* gcc.dg/debug/dwarf2/pr36690-1.c: New test.
	* gcc.dg/debug/dwarf2/pr36690-2.c: New test.
	* gcc.dg/debug/dwarf2/pr36690-3.c: New test.
	* gcc.dg/debug/dwarf2/pr37616.c: New test.

From-SVN: r140948