Merge "Document that ASharedMemory_create fds may or may not be CLOEXEC." am: 9e499bc47f am: 6b7a48e022 am: 3767a044ff am: b633e4c544 am: 833254d242

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1419344

Change-Id: Id98f206f95d5bf23e1053d65c696750d37575423