Add alignas to the permitted features set with some restrictions. (Thanks @kimbarrett for the help)
------------- Commit messages: - HotSpot Style Guide changes Changes: https://git.openjdk.org/jdk/pull/11404/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11404&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8252584 Stats: 94 lines in 2 files changed: 92 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/11404.diff Fetch: git fetch https://git.openjdk.org/jdk pull/11404/head:pull/11404 PR: https://git.openjdk.org/jdk/pull/11404
