[Rev 03] RFR: 6643: Make VM Operations rule consider close consecutive events in score

[Jessye Coleman-Shapiro]

> This patch modifies the VM Operations rule's score calculation so that is considers blocking that could result from the combination of multiple close consecutive operations.  Right now an application's score only takes into account the longest event in its calculation. 
> 
> At the moment I have determined two events to be "close" if they occur within 0.01 s of one another.

The pull request has been updated with 1 additional commit.

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Added commits:
 - 156c9015: Make caller thread equals comparison null check

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/42/files
  - new: https://git.openjdk.java.net/jmc/pull/42/files/d4950e2f..156c9015

Webrevs:
 - full: https://webrevs.openjdk.java.net/jmc/42/webrev.03
 - incr: https://webrevs.openjdk.java.net/jmc/42/webrev.02-03

  Stats: 2 lines in 1 file changed: 1 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/42.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/42/head:pull/42

PR: https://git.openjdk.java.net/jmc/pull/42