RFR: Build failing in universal tvars

[Vicente Romero]

Suppressing warnings in some tests for them to pass, also the build was failing

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Commit messages:
 - another try
 - debugging commit
 - the build is failing due to universal tvars warnings

Changes: https://git.openjdk.java.net/valhalla/pull/669/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=669&range=00
  Stats: 65 lines in 48 files changed: 61 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/669.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/669/head:pull/669

PR: https://git.openjdk.java.net/valhalla/pull/669