Merge "libbinder: do not always compute open ashmem size" am: ad0d71da am:...

Merge "libbinder: do not always compute open ashmem size" am: ad0d71da am: 7e85d0d3 am: 946bb232 am: b8ba6b18

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1850298

Change-Id: I9a21b04b670475f69f2a7724a9e6c2b148a9e0b9