RFR: Assorted minor things [v2]

[Robbin Ehn]

> Assorted minor things

Robbin Ehn 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 13 additional commits since the last revision:

 - Merge branch 'fibers' into mefix
 - Missed zero
 - Fixed
 - requires creep fix
 - Removed unused template from arch
 - Removed _mode and asorted
 - Removed unused template and asorted
 - Fixed assert
 - Fixes with some asserts
 - Requires barrier fix
 - ... and 3 more: https://git.openjdk.java.net/loom/compare/fad6a905...c540d83c

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

Changes:
  - all: https://git.openjdk.java.net/loom/pull/124/files
  - new: https://git.openjdk.java.net/loom/pull/124/files/fa4df677..c540d83c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=loom&pr=124&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=loom&pr=124&range=00-01

  Stats: 783 lines in 17 files changed: 336 ins; 358 del; 89 mod
  Patch: https://git.openjdk.java.net/loom/pull/124.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/124/head:pull/124

PR: https://git.openjdk.java.net/loom/pull/124