[code-reflection] RFR: Support bytecode generation for invocation of varArg method

[Mourad Abbay]

Support bytecode generation for invocation of varArg method.

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Commit messages:
 - Support bytecode generation for invocation of varArg method

Changes: https://git.openjdk.org/babylon/pull/272/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=272&range=00
  Stats: 108 lines in 2 files changed: 104 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/272.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/272/head:pull/272

PR: https://git.openjdk.org/babylon/pull/272