[lworld] RFR: 8293127: Valhalla: gcbasher update for new bytecodes

[Roger Riggs]

Update bytecode decompiler in hotspot gcbasher to be able to skip over new bytecodes.
Otherwise, the gcbasher fails when it runs on a value class.

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Commit messages:
 - Merge branch 'lworld' into 8293127-gcbasher
 - 8293127: Valhalla: gcbasher update for new bytecodes

Changes: https://git.openjdk.org/valhalla/pull/731/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=731&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8293127
  Stats: 6 lines in 1 file changed: 4 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/731.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/731/head:pull/731

PR: https://git.openjdk.org/valhalla/pull/731