[PATCH] Fix #1675 by using theoretical maximum addressable range on 64-bit platforms

[Peter Bex]

Hi all,

As discussed in the ticket and on IRC, the default maximum heap size
is *not* to kill processes early to prevent programs from running amok,
but as a way to avoid allocating more than our C_word pointers can
address with the masked out bits.

Therefore, the value on 64-bit platforms is not correct - it is 2GB
there, which is the 32-bit limit.  Attached is a signed-off copy of
Dieggsy's trivial patch with a change in the NEWS file to point this
out to users as this may be an important change for people relying
on this limit for other reasons.

Cheers,
Peter

0001-Increase-maximum-heap-size-on-64-bit-machines.patch
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