Merge "Mark getpagesize() const." am: 48d405ea4b am: 6663a539b4 am: 23925d9c91 am: 511c5aa8cb

Original change: https://android-review.googlesource.com/c/platform/bionic/+/2636854

Change-Id: I677f499707ca5ed6c8d7287b8a9fe8503804edc4
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>