retain debug stmt order when moving to successors

retain debug stmt order when moving to successors

We iterate over debug stmts from the last one in new_bb, and we insert
them before the first post-label stmt in each dest block, without
moving the insertion iterator, so they end up reversed.  Moving the
insertion iterator fixes this.

for  gcc/ChangeLog

	* tree-inline.c (maybe_move_debug_stmts_to_successors): Don't
	reverse debug stmts.