Add memory randomization to MallocDebug
Add memory randomization to MallocDebug

Summary: Add support to randomize the memory returned from malloc/memalign/posix_memalign.

Reviewed By: minjang

Differential Revision: D19566468

fbshipit-source-id: 6bdb1b909da07246c7ba49ad0bbdd3e7c6238069

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