Merge "Update smallvec to 1.8.0" am: 2b8efd428c am: 3d0e7105d4 am: ac24ff2144

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/smallvec/+/2004421

Change-Id: I9b7a911a4b5894136e9368835a7680457937ad11