RFR: 8343436: Regression in StackMapGenerator after JDK-8339205

[Adam Sotona]

This patch fixes regression in StackMapGenerator caused by JDK-8339205 + added test.

Please review.

Thanks,
Adam

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Commit messages:
 - 8343436: Regression in StackMapGenerator after JDK-8339205

Changes: https://git.openjdk.org/jdk/pull/21828/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=21828&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8343436
  Stats: 21 lines in 2 files changed: 19 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/21828.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/21828/head:pull/21828

PR: https://git.openjdk.org/jdk/pull/21828