0.7.6.14:

0.7.6.14:
	Fix potential off-by-one in SCRUB-CONTROL-STACK when the stack
	grows downwards.
        v-----v-- guard page extent
	[    ||               ]
             ^-- word at which we should stop scrubbing
        in contrast with
                         v----v-- guard page extent
        [                |    ]
                         ^-- word at which we should stop scrubbing
	... <= changes to <
	... I thought this might fix the large dynamic sizes after
		purify seen on the x86 since 0.7.6.2, but no dice :-/