tcmalloc: Decrease the kHashbits to 12 effectively restoring the pre-r89459 size

Original CL:

- https://codereview.chromium.org/7200028

  Decrease the kHashbits to 12 effectively restoring the pre-r89459 size
  of the page heap.

  TBR=antonm
  TEST=VM usage drops on the perf bots
  Committed:
  http://src.chromium.org/viewvc/chrome?view=rev&revision=89670

BUG=724399,b:70905156

Change-Id: Id0eedab1c33b53e47970561547f75c440f5d9ea1
Reviewed-on: https://chromium-review.googlesource.com/c/1130808
Reviewed-by: Will Harris <wfh@chromium.org>
Commit-Queue: Gabriel Marin <gmx@chromium.org>
Cr-Original-Commit-Position: refs/heads/master@{#597319}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: bdf3a038f3def4629fe14c5b47520cacb5cc7491
1 file changed
tree: f73d25bcff81bca76677d43dae1b04654a190782
  1. src/