Integrated: 7904065: Classfile version < 45 synthetic methods should not set ACC_SYNTHETIC

[Leonid Kuskov]

[CODETOOLS-7904065](https://bugs.openjdk.org/browse/CODETOOLS-7904065) Classfile version < 45 synthetic methods should not set ACC_SYNTHETIC

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Commit messages:
 - CODETOOLS-7904065: Classfile version < 45 synthetic methods should not set ACC_SYNTHETIC

Changes: https://git.openjdk.org/asmtools/pull/89/files
  Webrev: https://webrevs.openjdk.org/?repo=asmtools&pr=89&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7904065
  Stats: 16 lines in 3 files changed: 14 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/asmtools/pull/89.diff
  Fetch: git fetch https://git.openjdk.org/asmtools.git pull/89/head:pull/89

PR: https://git.openjdk.org/asmtools/pull/89