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We were previously unable to see the allocation size in the minidump
because it was optimized out. This should keep it around.

BUG=643845
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2349553002
Cr-Commit-Position: refs/heads/master@{#419076}