Integrated: cleaning up overload resolution code

[Vicente Romero]

Overload resolution cleanup

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Commit messages:
 - cleaning up overload resolution code

Changes: https://git.openjdk.java.net/valhalla/pull/648/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=648&range=00
  Stats: 29 lines in 3 files changed: 3 ins; 13 del; 13 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/648.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/648/head:pull/648

PR: https://git.openjdk.java.net/valhalla/pull/648