[code-reflection] RFR: Fixed BytecodeGenerator INDY calls with invalid interface method type

[Adam Sotona]

`BytecodeGenerator` provided INDY calls with invalid `interfaceMethodType` when it differs from the actual `dynamicMethodType`.

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Commit messages:
 - Fixed BytecodeGenerator INDY

Changes: https://git.openjdk.org/babylon/pull/648/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=648&range=00
  Stats: 29 lines in 2 files changed: 17 ins; 0 del; 12 mod
  Patch: https://git.openjdk.org/babylon/pull/648.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/648/head:pull/648

PR: https://git.openjdk.org/babylon/pull/648