RFR: 8255969: Improve java/io/BufferedInputStream/LargeCopyWithMark.java using jtreg tags

[Brian Burkhalter]

Please review this change which would replace the use of a system property and a child process with updated jtreg tags.

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Commit messages:
 - 8255969: Improve java/io/BufferedInputStream/LargeCopyWithMark.java using jtreg tags

Changes: https://git.openjdk.java.net/jdk/pull/1083/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1083&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255969
  Stats: 44 lines in 1 file changed: 1 ins; 23 del; 20 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1083.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1083/head:pull/1083

PR: https://git.openjdk.java.net/jdk/pull/1083