RFR: 8316973: GC: Make TestDisableDefaultGC use createTestJvm

[Hamlin Li]

On Tue, 26 Sep 2023 17:24:22 GMT, Leo Korinth <lkorinth at openjdk.org> wrote:

> There seems there is no need to strip external vm flags. The `@requires vm.gc=="null"` will handle the case when we iterate different GCs and we will then just skip the test.
> 
> Tested with:
> `make run-test TEST=open/test/hotspot/jtreg/gc/arguments/TestDisableDefaultGC.java JTREG='RETAIN=all;VERBOSE=all;JAVA_OPTIONS=-XX:+UseG1GC'` -> total 0
> `make run-test TEST=open/test/hotspot/jtreg/gc/arguments/TestDisableDefaultGC.java` -> success
> 
> started tier 1-5

Marked as reviewed by mli (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/15931#pullrequestreview-1651880228