Integrated: 8310679: [lw5] test refactoring, repurposing primitive classes tests

[Vicente Romero]

refactoring regression tests, adding some new ones and repurposing primitive classes tests

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Commit messages:
 - fixing white space issue
 - 8310679: [lw5] test refactoring, repurposing primitive classes tests

Changes: https://git.openjdk.org/valhalla/pull/870/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=870&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8310679
  Stats: 840 lines in 16 files changed: 260 ins; 580 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/870.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/870/head:pull/870

PR: https://git.openjdk.org/valhalla/pull/870