RFR: 8274620: resourcehogs/serviceability/sa/TestHeapDumpForLargeArray.java is timing out

[Lin Zang]

This PR fix the issue of JDK-8274620 (resourcehogs/serviceability/sa/TestHeapDumpForLargeArray.java is timing out)
The root cause is that `BufferedOutputStream` should be used when writting data to file.

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Commit messages:
 - Undo problem list of the test case
 - 8274620: TestHeapDumpForLargeArray.java is timing out

Changes: https://git.openjdk.java.net/jdk/pull/5860/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=5860&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8274620
  Stats: 4 lines in 2 files changed: 0 ins; 2 del; 2 mod
  Patch: https://git.openjdk.java.net/jdk/pull/5860.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/5860/head:pull/5860

PR: https://git.openjdk.java.net/jdk/pull/5860