RFR: fail during inference if primitive classes are bounds during the first overload resolution phase

[Vicente Romero]

Fail during inference if any bound is a primitive class during the first phase

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Commit messages:
 - removing debugging code
 - fail during inference if primitive classes are bounds during the first overload resolution phase

Changes: https://git.openjdk.java.net/valhalla/pull/651/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=651&range=00
  Stats: 15 lines in 2 files changed: 11 ins; 3 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/651.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/651/head:pull/651

PR: https://git.openjdk.java.net/valhalla/pull/651