RFR: The Grand ScopedValue renaming [v4]

[Andrew Haley]

> Rename ExtentLocal to ScopedValue

Andrew Haley has updated the pull request incrementally with one additional commit since the last revision:

  Javadoc

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Changes:
  - all: https://git.openjdk.org/loom/pull/192/files
  - new: https://git.openjdk.org/loom/pull/192/files/7baac2a5..5bc28342

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=loom&pr=192&range=03
 - incr: https://webrevs.openjdk.org/?repo=loom&pr=192&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/loom/pull/192.diff
  Fetch: git fetch https://git.openjdk.org/loom pull/192/head:pull/192

PR: https://git.openjdk.org/loom/pull/192