RFR: 7902888: Excess entries in BootstrapMethods with the same bsm, bsmKind, bsmArgs

[Leonid Kuskov]

This is the fix for a regression made during the fix of [CODETOOLS-7902888]( https://bugs.openjdk.org/browse/CODETOOLS-7902888)<br>
Also added extra methods to Main classes to allow working with external tools.

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Commit messages:
 - 7902888: Excess entries in BootstrapMethods with the same bsm, bsmKind, bsmArgs

Changes: https://git.openjdk.org/asmtools/pull/47/files
 Webrev: https://webrevs.openjdk.org/?repo=asmtools&pr=47&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7902888
  Stats: 282 lines in 11 files changed: 186 ins; 38 del; 58 mod
  Patch: https://git.openjdk.org/asmtools/pull/47.diff
  Fetch: git fetch https://git.openjdk.org/asmtools pull/47/head:pull/47

PR: https://git.openjdk.org/asmtools/pull/47