Integrated: JDK-8268980: [lword] Fix Class::descriptorString to return L-descriptor for primitive ref type

[Mandy Chung]

JDK-8268980: [lword] Fix Class::descriptorString to return L-descriptor for primitive ref type

-------------

Commit messages:
 - remove tab and trailing whitespaces
 - add a new test with primitive reference type as parameter type
 - JDK-8268980: [lword] Fix Class::descriptorString to return L-descriptor for primitive ref type
 - Merge branch 'lqagain' of https://github.com/openjdk/valhalla into test-cleanup
 - JDK-8268908: Update test/jdk/valhalla/valuetypes tests to prepare for jtreg 6 and other clean up

Changes: https://git.openjdk.java.net/valhalla/pull/451/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=451&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8268980
  Stats: 50 lines in 3 files changed: 49 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/451.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/451/head:pull/451

PR: https://git.openjdk.java.net/valhalla/pull/451