explow.c (allocate_dynamic_stack_space): Call do_pending_stack_adjust before handling flag_split_stack.

gcc/:
	* explow.c (allocate_dynamic_stack_space): Call
	do_pending_stack_adjust before handling flag_split_stack.
gcc/testsuite/:
	* gcc.dg/split-7.c: New test.

From-SVN: r240764