RFR: 8253261: Disable CDS full module graph until JDK-8253081 is fixed

[Ioi Lam]

Please review this trivial patch.

[JDK-8244778](https://bugs.openjdk.java.net/browse/JDK-8244778) (Archive full module graph in CDS) is causing failures
in GC ([JDK-8253081](https://bugs.openjdk.java.net/browse/JDK-8253081))

This patch disables the *use* of the CDS module graph at run time, which seems to avoid the GC problems. The module
graph is still being archived into CDS, but that seems to be harmless.

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

Commit messages:
 - 8253261: Disable CDS full module graph until JDK-8253081 is fixed

Changes: https://git.openjdk.java.net/jdk/pull/213/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=213&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253261
  Stats: 3 lines in 2 files changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/213.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/213/head:pull/213

PR: https://git.openjdk.java.net/jdk/pull/213