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Bionic's calloc() is smart enough to not zero out memory if it gets that memory
from an anonyous mmap.  Thus, if we use malloc for large allocations, we cause
unnecessary memory duplication by following the malloc() with a memset().

An even better approach would be to replace the known large calloc() calls with
dvmAllocRegion() allocation.

Change-Id: Id308f541c9a040d5929bf991b6c2bfdefb823c3c