RFR: 8310839: [lw5] implicit constructors must be public and declared in a value class

[Vicente Romero]

implicit constructors must be public and declared in a value class

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Commit messages:
 - 8310839: [lw5] implicit constructors must be public and declared in a value class

Changes: https://git.openjdk.org/valhalla/pull/877/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=877&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310839
  Stats: 118 lines in 4 files changed: 109 ins; 6 del; 3 mod
  Patch: https://git.openjdk.org/valhalla/pull/877.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/877/head:pull/877

PR: https://git.openjdk.org/valhalla/pull/877