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Currently, the allocation and deallocation stack traces are stored in
separate 200 byte buffers. This change stores them together in a single
400-byte buffer so that deallocations can use any unused space from the
allocation. This improves memory density for deallocations (which is
usually what we care most about in UAFs) and does not affect
allocations.

Bug: 951410
Change-Id: I6fa36a80a605b16eb2d92919b3fd4a5ff60dfc84
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1566455
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#650539}