RFR: 8306623: (bf) CharBuffer::allocate throws unexpected exception type with some CharSequences [v2]

[Brian Burkhalter]

> When appending a `CharBuffer`, perform a specific check for buffer overflow before invoking `put()`.

Brian Burkhalter has updated the pull request incrementally with one additional commit since the last revision:

  8306623: Update comment; move test code location

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13632/files
  - new: https://git.openjdk.org/jdk/pull/13632/files/ce70e879..118076c9

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13632&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13632&range=00-01

  Stats: 119 lines in 4 files changed: 60 ins; 30 del; 29 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