Merge "Upgrade rust/crates/smallvec to 1.4.2" am: 5237030d92 am: 2b62ce0785

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/smallvec/+/1397507

Change-Id: If823817f51f07c3da208ecc5c149ae6b4ddbdb3c