[jdk17u-dev] RFR: 8269077: TestSystemGC uses "require vm.gc.G1" for large pages subtest

[Goetz Lindenmaier]

I backport this test fix to simplify a follow up backport. 
I think this is useful, too.

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

Commit messages:
 - Backport 1a818154cfe852a680070c5c07f2df33109e5b54

Changes: https://git.openjdk.java.net/jdk17u-dev/pull/238/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk17u-dev&pr=238&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8269077
  Stats: 9 lines in 1 file changed: 7 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk17u-dev/pull/238.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17u-dev pull/238/head:pull/238

PR: https://git.openjdk.java.net/jdk17u-dev/pull/238