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Make use of the stack trace packing from https://crrev.com/627865 to
reduce memory usage to store stacks on 64-bit systems by ~60% percent. A
GWP-ASan microbenchmark did not show this change to noticably regress
performance.

Bug: 896019, 921237
Change-Id: Iad6e803f18ff12e5fd3079b9821d11bc0918bead
Reviewed-on: https://chromium-review.googlesource.com/c/1448522
Auto-Submit: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#628034}