RFR: Assorted minor things

[Robbin Ehn]

Assorted minor things

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Commit messages:
 - 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
 - Asorted
 - ... and 2 more: https://git.openjdk.java.net/loom/compare/e6849098...fa4df677

Changes: https://git.openjdk.java.net/loom/pull/124/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=124&range=00
  Stats: 164 lines in 7 files changed: 30 ins; 62 del; 72 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