RFR: 8321053: Use ByteArrayInputStream.buf directly when parameter of transferTo() is trusted [v6]

[Brian Burkhalter]

> Pass `ByteArrayInputStream.buf ` directly to the `OutputStream` parameter of `BAIS.transferTo` only if the target stream is in the `java.io` package.

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

  8321053: s/tmp/tmpbuf/

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Changes:
  - all: https://git.openjdk.org/jdk/pull/16893/files
  - new: https://git.openjdk.org/jdk/pull/16893/files/8a13b553..b0d4cb96

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=16893&range=05
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=16893&range=04-05

  Stats: 6 lines in 1 file changed: 0 ins; 0 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/16893.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16893/head:pull/16893

PR: https://git.openjdk.org/jdk/pull/16893