Merge "Add @hide to @CorePlatformApi in libcore.io.Memory" am: 31a65fcf2a am: 22f085bda3 am: 5e918d7689

Original change: https://android-review.googlesource.com/c/platform/libcore/+/1705405

Change-Id: I6b667d93bda19eef81d7707c8db0db9ebd19248c