RFR: 8265932: Move safepoint related fields from class Thread to JavaThread [v2]

[Patricio Chilano Mateo]

> Hi,
> 
> Please review the following change. A left over from 8265453 was moving _poll_data from class Thread to JavaThread. There are also other fields like _no_safepoint_count and _visited_for_critical_count that should be moved.
> Tested in mach5 tiers 1-5. Tested it builds ppc, arm and s390. Tested it builds in release, optimized and fastdebug modes.
> 
> Thanks,
> Patricio

Patricio Chilano Mateo has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains three commits:

 - Merge branch 'master' into 8265932
 - forgot to remove no_safepoint_verifier() declaration
 - v1

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

Changes: https://git.openjdk.java.net/jdk/pull/3695/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3695&range=01
  Stats: 239 lines in 30 files changed: 90 ins; 100 del; 49 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3695.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3695/head:pull/3695

PR: https://git.openjdk.java.net/jdk/pull/3695