[lworld] RFR: JDK-8269023 [lworld] L/Q<type> support [v2]

[David Simms]

> Merge work from lqagain branch

David Simms has updated the pull request incrementally with one additional commit since the last revision:

  8218159: ValueBootstrapMethods.isSubstitutable should not filter synthetic fields

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

Changes:
  - all: https://git.openjdk.java.net/valhalla/pull/453/files
  - new: https://git.openjdk.java.net/valhalla/pull/453/files/521bed27..2a7e977a

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=valhalla&pr=453&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=valhalla&pr=453&range=00-01

  Stats: 84 lines in 3 files changed: 80 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/453.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/453/head:pull/453

PR: https://git.openjdk.java.net/valhalla/pull/453