RFR: 8080272 Refactor I/O stream copying to use InputStream.transferTo/readAllBytes and Files.copy [v11]

[Andrey Turbanov]

> 8080272  Refactor I/O stream copying to use InputStream.transferTo/readAllBytes and Files.copy

Andrey Turbanov has updated the pull request incrementally with one additional commit since the last revision:

  8080272: Refactor I/O stream copying to use java.io.InputStream.transferTo
  remove unnecessary file.exists() check

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1853/files
  - new: https://git.openjdk.java.net/jdk/pull/1853/files/6614a10f..6e71e961

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1853&range=10
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1853&range=09-10

  Stats: 3 lines in 1 file changed: 0 ins; 2 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1853.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1853/head:pull/1853

PR: https://git.openjdk.java.net/jdk/pull/1853