[code-reflection] RFR: Support bytecode generation for invocation of varArg method [v2]

[Mourad Abbay]

> Support bytecode generation for invocation of varArg method.

Mourad Abbay has updated the pull request incrementally with two additional commits since the last revision:

 - Add test cases for empty var arg, long and double
 - Move code related to InvokeOp from processOperands(Op).

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Changes:
  - all: https://git.openjdk.org/babylon/pull/272/files
  - new: https://git.openjdk.org/babylon/pull/272/files/8aa9c038..b2a2680f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=babylon&pr=272&range=01
 - incr: https://webrevs.openjdk.org/?repo=babylon&pr=272&range=00-01

  Stats: 49 lines in 2 files changed: 25 ins; 21 del; 3 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