[code-reflection] RFR: 8337157: Second operand to array.load should be an int

[Mourad Abbay]

Convert array access indexing expression to int.

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Commit messages:
 - Convert array access indexing expression to int

Changes: https://git.openjdk.org/babylon/pull/194/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=194&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8337157
  Stats: 16 lines in 2 files changed: 15 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/194.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/194/head:pull/194

PR: https://git.openjdk.org/babylon/pull/194