Update symbol information for --release 16 to JDK 16 b28, includes updates for JEP 390.
------------- Commit messages: - 8257457 Changes: https://git.openjdk.java.net/jdk/pull/1754/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1754&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8257457 Stats: 235 lines in 4 files changed: 149 ins; 2 del; 84 mod Patch: https://git.openjdk.java.net/jdk/pull/1754.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/1754/head:pull/1754 PR: https://git.openjdk.java.net/jdk/pull/1754
