A small optimization, optimize the BufferWriter implementation and use of ClassFile, provide faster patchInt and skip
------------- Commit messages: - Suggestions from @cl4es - fix build error - remove BufWriter#patchInt - optimize BufWriterImpl#patchInt Changes: https://git.openjdk.org/jdk/pull/20780/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=20780&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8339317 Stats: 48 lines in 8 files changed: 28 ins; 0 del; 20 mod Patch: https://git.openjdk.org/jdk/pull/20780.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/20780/head:pull/20780 PR: https://git.openjdk.org/jdk/pull/20780
