Fix transform_to_exit_first_loop_alt with -g

2015-11-06  Tom de Vries  <tom@codesourcery.com>

	* tree-cfg.c (gimple_split_block_before_cond_jump): Split before
	cond_jump, instead of split after last nondebug insn before cond_jump.
	* tree-parloops.c (transform_to_exit_first_loop_alt): Verify ssa before
	returning.

From-SVN: r229847

gcc/ChangeLog

+2015-11-06  Tom de Vries  <tom@codesourcery.com>
+
+	* tree-cfg.c (gimple_split_block_before_cond_jump): Split before
+	cond_jump, instead of split after last nondebug insn before cond_jump.
+	* tree-parloops.c (transform_to_exit_first_loop_alt): Verify ssa before
+	returning.
+
 2015-11-06  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	PR target/68088

gcc/tree-cfg.c

@@ -5783,7 +5783,7 @@ gimple_split_block_before_cond_jump (basic_block bb)
   if (gimple_code (last) != GIMPLE_COND
       && gimple_code (last) != GIMPLE_SWITCH)
     return NULL;
-  gsi_prev_nondebug (&gsi);
+  gsi_prev (&gsi);
   split_point = gsi_stmt (gsi);
   return split_block (bb, split_point)->dest;
 }

gcc/tree-parloops.c

@@ -1737,6 +1737,8 @@ transform_to_exit_first_loop_alt (struct loop *loop,
   /* Recalculate dominance info.  */
   free_dominance_info (CDI_DOMINATORS);
   calculate_dominance_info (CDI_DOMINATORS);
+
+  checking_verify_ssa (true, true);
 }
 
 /* Tries to moves the exit condition of LOOP to the beginning of its header