Make the nested classes inside FdLibm.java consistently package-access, static and final.
------------- Commit messages: - JDK-8308049: Refactor nested class declarations in FdLibm.java Changes: https://git.openjdk.org/jdk/pull/13972/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13972&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8308049 Stats: 17 lines in 1 file changed: 0 ins; 0 del; 17 mod Patch: https://git.openjdk.org/jdk/pull/13972.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13972/head:pull/13972 PR: https://git.openjdk.org/jdk/pull/13972
