When appending a `CharBuffer`, perform a specific check for buffer overflow before invoking `put()`.
------------- Commit messages: - 8306623: (bf) CharBuffer::allocate throws unexpected exception type with some CharSequences Changes: https://git.openjdk.org/jdk/pull/13632/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13632&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8306623 Stats: 65 lines in 2 files changed: 39 ins; 0 del; 26 mod Patch: https://git.openjdk.org/jdk/pull/13632.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13632/head:pull/13632 PR: https://git.openjdk.org/jdk/pull/13632
