[lworld] RFR: 8269279: [lworld] 8269231 causes build failures

[David Simms]

Removed signed hex formats since "x" is unsigned by definition

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

Commit messages:
 - 8269279: [lworld] 8269231 causes build failures

Changes: https://git.openjdk.java.net/valhalla/pull/463/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=463&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269279
  Stats: 19 lines in 3 files changed: 6 ins; 6 del; 7 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/463.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/463/head:pull/463

PR: https://git.openjdk.java.net/valhalla/pull/463