This patch caused a bootstrap failure on AIX.

2016-08-24  Andreas Krebbel  <krebbel@linux.vnet.ibm.com>

	Revert
	2016-08-23  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* explow.c (get_dynamic_stack_size): Take known alignment of stack
	pointer + STACK_DYNAMIC_OFFSET into account when calculating the
	size needed.

From-SVN: r239735