Refactor code from inside of CompressedStream into its own unit. This code is likely to be used in future refactorings, such as JDK-8292818 (replace 96-bit representation for field metadata with variable-sized streams).
Add gtests. ------------- Commit messages: - 8292758: put support for UNSIGNED5 format into its own header file Changes: https://git.openjdk.org/jdk/pull/10067/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10067&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8292758 Stats: 935 lines in 8 files changed: 797 ins; 93 del; 45 mod Patch: https://git.openjdk.org/jdk/pull/10067.diff Fetch: git fetch https://git.openjdk.org/jdk pull/10067/head:pull/10067 PR: https://git.openjdk.org/jdk/pull/10067
