Update MachineDescriptionTwosComplement.java comment to indicate that LP64 machines are no longer uncommon.
------------- Commit messages: - JDK-8283627 Changes: https://git.openjdk.org/jdk/pull/9967/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=9967&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8283627 Stats: 3 lines in 1 file changed: 1 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/9967.diff Fetch: git fetch https://git.openjdk.org/jdk pull/9967/head:pull/9967 PR: https://git.openjdk.org/jdk/pull/9967
