tcmalloc: Use aggressive decommit by default.

Optimize for memory use instead of performance, to achieve parity with
the old version of tcmalloc.

BUG=724399,b:70905156

Change-Id: I11cf263b8c9595b260bf2046ab9593c2b8f66a00
Reviewed-on: https://chromium-review.googlesource.com/1130812
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Gabriel Marin <gmx@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#586439}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 67e51fc88b67211901082b7ddbfc13f9b14a520b
1 file changed
tree: 5a9c86e7b888092b4ecf18e634bdb6b5241041d0
  1. src/