RFR: 8309979: BootstrapMethods attribute is missing in class files recreated by SA

[Ashutosh Mehra]

Please review this PR that extends SA to write BootstrapMethods attribute when dumping the class files.

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Commit messages:
 - 8309979: BootstrapMethods attribute is missing in class files recreated by SA

Changes: https://git.openjdk.org/jdk/pull/14495/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14495&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309979
  Stats: 80 lines in 3 files changed: 72 ins; 2 del; 6 mod
  Patch: https://git.openjdk.org/jdk/pull/14495.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14495/head:pull/14495

PR: https://git.openjdk.org/jdk/pull/14495