RFR: 8257668: SA JMap - skip non-java thread stack dump for heap dump [v2]

[Lin Zang]

> when use SA JMap dump commands, such as "jhsdb jmap --binaryheap" or "dump heap" with "jhsdb clhsdb", it keep printing "dumpStack: not java Thread.". 
> Skip non-java thread stack dump to avoid printing the message.

Lin Zang has updated the pull request incrementally with one additional commit since the last revision:

  remove deadcode of println instead of change in HeapHprofBinWriter

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/1593/files
  - new: https://git.openjdk.java.net/jdk/pull/1593/files/f4df6c53..f1361a68

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=1593&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=1593&range=00-01

  Stats: 5 lines in 2 files changed: 0 ins; 4 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1593.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1593/head:pull/1593

PR: https://git.openjdk.java.net/jdk/pull/1593