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
Change-Id: Ic919812f076761f1a4f5ae8313061118f1e19c64
1 file changed