S/390: Lower requirements for successful htm tests.

S/390: Lower requirements for successful htm tests.

The attached patch makes the htm tests on s390 less sensitive to
spurious abort.  Please check the commit comment for details.  The
modified tests have been run once on a zEC12.

gcc/ChangeLog:

2016-11-18  Dominik Vogt  <vogt@linux.vnet.ibm.com>

	* config/rs6000/rs6000.c (rs6000_stack_info): PR/77359: Properly align
	local variables in functions calling alloca.  Also update the ASCII
	drawings
	* config/rs6000/rs6000.h (STARTING_FRAME_OFFSET, STACK_DYNAMIC_OFFSET):
	PR/77359: Likewise.
	* config/rs6000/aix.h (STARTING_FRAME_OFFSET, STACK_DYNAMIC_OFFSET):
	PR/77359: Copy AIX specific versions of the rs6000.h macros to aix.h.

From-SVN: r242591