On 32 bit systems, force huge allocs on arena 0.

The new version of jemalloc has moved all huge allocations from
a single cache, to a per arena cache. This can result in virtual
address space exhaustion when someone has a pattern where they
allocate huge allocations from new threads all of the time.

Bug: 22172059
(cherry picked from commit dcfc29b2aa1ee53fe4b40368d02f80ca4bddeabc)

Change-Id: I0f380c1295a49eb76390cf5f3c9285e685122706
1 file changed