RFR: 4860681: (bf) Add CharBuffer absolute bulk put method for CharSequence [v4]

[Brian Burkhalter]

> Add to `java.nio.CharBuffer` an absolute bulk put method which takes a `CharSequence` as its source of `char`s.

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

  4860681: Heap and direct buffer specializations

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13744/files
  - new: https://git.openjdk.org/jdk/pull/13744/files/831cea6f..9e1ce482

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13744&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13744&range=02-03

  Stats: 80 lines in 2 files changed: 79 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/13744.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13744/head:pull/13744

PR: https://git.openjdk.org/jdk/pull/13744