RFR: Added VTMT timeout handler [v2]

[Leonid Mesnik]

> Added VTMT timeout handler

Leonid Mesnik 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 five additional commits since the last revision:

 - Added #ifdef ASSERT
 - Merge branch 'fibers' of https://github.com/openjdk/loom into vtmt
 - Merge branch 'fibers' of https://github.com/openjdk/loom into vtmt
 - printer added
 - Added VTMT timeout handler

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

Changes:
  - all: https://git.openjdk.java.net/loom/pull/61/files
  - new: https://git.openjdk.java.net/loom/pull/61/files/845cef40..c82af1ea

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=loom&pr=61&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=loom&pr=61&range=00-01

  Stats: 11423 lines in 501 files changed: 7014 ins; 2424 del; 1985 mod
  Patch: https://git.openjdk.java.net/loom/pull/61.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/61/head:pull/61

PR: https://git.openjdk.java.net/loom/pull/61