[jdk13u-dev] Integrated: 8238932: Invalid tier1_gc_1 test group definition

[Yuri Nesterenko]

TEST.group cleanup fix

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Commit messages:
 - Backport 3c18ed58a143f04d42ad4d4d0eae88f65cd3eb58

Changes: https://git.openjdk.java.net/jdk13u-dev/pull/271/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk13u-dev&pr=271&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8238932
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk13u-dev/pull/271.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk13u-dev pull/271/head:pull/271

PR: https://git.openjdk.java.net/jdk13u-dev/pull/271