[code-reflection] Integrated: Fix method resolution on invoke op wrapper

[Paul Sandoz]

Changes in the modeling of invoke expressions broke HAT. This PR fixes that.

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Commit messages:
 - Fix method resultion on invoke op wrapper

Changes: https://git.openjdk.org/babylon/pull/243/files
  Webrev: https://webrevs.openjdk.org/?repo=babylon&pr=243&range=00
  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/babylon/pull/243.diff
  Fetch: git fetch https://git.openjdk.org/babylon.git pull/243/head:pull/243

PR: https://git.openjdk.org/babylon/pull/243