[lworld] RFR: 8321941: Migrate test/jdk/valhalla/valuetypes from primitive classes to null-restricted types [v3]

[Mandy Chung]

> Migrate test/jdk/valhalla/valuetypes tests to use null-restricted types instead.

Mandy Chung has updated the pull request incrementally with one additional commit since the last revision:

  move @summary before @run

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

Changes:
  - all: https://git.openjdk.org/valhalla/pull/963/files
  - new: https://git.openjdk.org/valhalla/pull/963/files/d8683abd..1eb6a6da

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=valhalla&pr=963&range=02
 - incr: https://webrevs.openjdk.org/?repo=valhalla&pr=963&range=01-02

  Stats: 43 lines in 19 files changed: 21 ins; 21 del; 1 mod
  Patch: https://git.openjdk.org/valhalla/pull/963.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/963/head:pull/963

PR: https://git.openjdk.org/valhalla/pull/963