RFR: Extent local rename

[Andrew Haley]

The Grand Renaming.

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Commit messages:
 - The Grand Renaming.
 - The grand ExteentLocal renaming.
 - Merge https://github.com/openjdk/loom into fibers
 - Merge https://github.com/openjdk/loom into fibers
 - Merge https://github.com/openjdk/loom into fibers
 - Merge https://github.com/openjdk/loom into fibers
 - Merge https://github.com/openjdk/loom into fibers
 - Merge https://github.com/openjdk/loom into fibers
 - Merge https://github.com/openjdk/loom into fibers
 - Merge branch 'fibers' of https://github.com/openjdk/loom into fibers
 - ... and 17 more: https://git.openjdk.java.net/loom/compare/2e72645c...38f4fd27

Changes: https://git.openjdk.java.net/loom/pull/162/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=162&range=00
  Stats: 3936 lines in 52 files changed: 1884 ins; 1884 del; 168 mod
  Patch: https://git.openjdk.java.net/loom/pull/162.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/162/head:pull/162

PR: https://git.openjdk.java.net/loom/pull/162