am 884e3bc2: (-s ours) am 6426bd62: am f53f9c6d: [DO NOT MERGE] GraphicBufferAllocator: stall alloc for async frees

* commit '884e3bc29ed190a856f7562a73548868a7ecef2f':
  [DO NOT MERGE] GraphicBufferAllocator: stall alloc for async frees