[lworld] RFR: 8281336: [lworld] Remove workaround in LambdaToMethod to circumvent BootstrapMethodError

[Srikanth Adayapalam]

Remove the workaround in Javac and include the fix from Mandy for runtime in lieu.

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Commit messages:
 - 8281336: Remove workaround in LambdaToMethod to circumvent BootstrapMethodError

Changes: https://git.openjdk.java.net/valhalla/pull/631/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=631&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8281336
  Stats: 12 lines in 2 files changed: 0 ins; 9 del; 3 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/631.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/631/head:pull/631

PR: https://git.openjdk.java.net/valhalla/pull/631