[lworld] RFR: 8282107: Valhalla: javac does not correctly recognize value class factory <init>

[Srikanth Adayapalam]

Cope with the ill effects of javac downgrading the value class file at lower source levels leaving fuller treatment to JDK-8282525

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Commit messages:
 - 8282107: Valhalla: javac does not correctly recognize value class factory <init>

Changes: https://git.openjdk.java.net/valhalla/pull/661/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=661&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8282107
  Stats: 89 lines in 3 files changed: 88 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/661.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/661/head:pull/661

PR: https://git.openjdk.java.net/valhalla/pull/661