[jdk11u-dev] RFR: 8208242: Add @requires to vmTestbase/gc/g1 tests

[Petra Alice Mikova]

Backport of JDK-8208242

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Commit messages:
 - Backport dc45757347f184d688da550ff0fc095be9930df1

Changes: https://git.openjdk.java.net/jdk11u-dev/pull/604/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk11u-dev&pr=604&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8208242
  Stats: 336 lines in 112 files changed: 336 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk11u-dev/pull/604.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk11u-dev pull/604/head:pull/604

PR: https://git.openjdk.java.net/jdk11u-dev/pull/604