RFR: 8269685: Optimize HeapHprofBinWriter implementation [v4]

[Lin Zang]

> This PR rewrite the implementation of the HeapHprofBinWriter, which could simplify the logic of current implementation.
> please see detail description at https://bugs.openjdk.java.net/browse/JDK-8269685.

Lin Zang has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'master' into hprof
 - fix write size issue
 - Merge branch 'master' into hprof
 - 8269685: Optimize HeapHprofBinWriter implementation

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/4666/files
  - new: https://git.openjdk.java.net/jdk/pull/4666/files/59691b54..cb1cbeb0

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=4666&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=4666&range=02-03

  Stats: 91418 lines in 1578 files changed: 64311 ins; 19652 del; 7455 mod
  Patch: https://git.openjdk.java.net/jdk/pull/4666.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/4666/head:pull/4666

PR: https://git.openjdk.java.net/jdk/pull/4666