RFR: bug: no warning shown for parameterized conversions

[Vicente Romero]

no warning is shown for parameterized conversions

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Commit messages:
 - bug: no warning shown for parameterized conversions

Changes: https://git.openjdk.java.net/valhalla/pull/666/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=666&range=00
  Stats: 102 lines in 3 files changed: 85 ins; 11 del; 6 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/666.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/666/head:pull/666

PR: https://git.openjdk.java.net/valhalla/pull/666