RFR: 8315988: Parallel: Make TestAggressiveHeap use createTestJvm [v2]

[Leo Korinth]

> Make TestAggressiveHeap use createTestJvm (so that the test forwards VM/JAVA_OPTIONS). The TestAggressiveHeap flag implicitly turns on the parallel gc, thus  `@requires vm.gc.Parallel`. 
> 
> Tested with:
> `make run-test TEST=open/test/hotspot/jtreg/gc/arguments/TestAggressiveHeap.java JTREG="JAVA_OPTIONS=-XX:+UseParallelGC"` (PASS 1)
> `make run-test TEST=open/test/hotspot/jtreg/gc/arguments/TestAggressiveHeap.java JTREG="JAVA_OPTIONS=-XX:+UseSerialGC"` (PASS 0)
> `make run-test TEST=open/test/hotspot/jtreg/gc/arguments/TestAggressiveHeap.java`(PASS 1)
> 
> Started hs_tier1, hs_tier2 to see that we do not propagate conflicting flags.

Leo Korinth has updated the pull request incrementally with one additional commit since the last revision:

  8315988: Parallel: Make TestAggressiveHeap use createTestJvm

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/15657/files
  - new: https://git.openjdk.org/jdk/pull/15657/files/8d88567d..289b55a8

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=15657&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=15657&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/15657.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/15657/head:pull/15657

PR: https://git.openjdk.org/jdk/pull/15657