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Failing to explicitly initialize stack dumping before adding a malloc hook that
uses it can cause problems. In particular, on Linux calling backtrace() can
load a library which calls malloc, meaning the hook will be recursive.

Bug: 764522
Change-Id: If602902aa4238903541ca52f765927369dbf6e71
Reviewed-on: https://chromium-review.googlesource.com/664301Reviewed-by: Erik Chen <erikchen@chromium.org>
Commit-Queue: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#501644}