RFR: Scope locals, Mark II.

[Andrew Haley]

Leaner and meaner.

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

Commit messages:
 - Merge
 - Correct ForkJoinTask.
 - Simplify and cleanup.
 - Simplify and cleanup.
 - Cleanup, remove FutureBindings and MultiBinding.
 - Intermediate
 - Backout mistake
 - Intermediate
 - Intermediate
 - Intermediate
 - ... and 11 more: https://git.openjdk.java.net/loom/compare/e8865cab...60f99986

Changes: https://git.openjdk.java.net/loom/pull/26/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=26&range=00
  Stats: 453 lines in 5 files changed: 407 ins; 43 del; 3 mod
  Patch: https://git.openjdk.java.net/loom/pull/26.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/26/head:pull/26

PR: https://git.openjdk.java.net/loom/pull/26