RFR: 8295288: Some vm_flags tests associate with a wrong BugID

[Joshua Cao]

Fixing incorrect bug IDs. IntxTest.java already has the correct bug ID, and SizeTTest has a different bug ID that is correct.

All changed tests passing locally.

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Commit messages:
 - 8295288: Some vm_flags tests associate with a wrong BugID

Changes: https://git.openjdk.org/jdk/pull/10703/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=10703&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295288
  Stats: 5 lines in 5 files changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/10703.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10703/head:pull/10703

PR: https://git.openjdk.org/jdk/pull/10703