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

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

Change-Id: I3181a2664f53f05692b01d053360a2389141bdc9