Workaround problem reading main stack on intel devices.

This works around a problem where ART can't read the lowest page
of the main stack.  The workaround is to add 4K to the stack
start address on the main stack on Intel.

Please see https://b2.corp.google.com/issues/17111575 for
underlying cause.

Cherry picked from d970bac6

Bug: 17031544
Change-Id: Ifc3216e10160bb1eec9d989fd57b10345bc89537