Merge "Zygote: disable heap 0'ing in apps." am: 1e19124f42 am: d44577e9e6 am: c12d11de03 am: b402e6930a

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/1462849

Change-Id: I98dcc2f8c22ba5e1a9a21e35c127619f9087568b