RFR: Fix unloading tests to not have extra full GCs.

Thu Mar 3 00:18:43 UTC 2022

Added -XX:-MethodFlushing to turn off the sweeper, which prevents full GCs that make the test useless.

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Commit messages:
 - Fix unloading tests to not have extra full GCs.

Changes: https://git.openjdk.java.net/loom/pull/94/files
 Webrev: https://webrevs.openjdk.java.net/?repo=loom&pr=94&range=00
  Stats: 12 lines in 5 files changed: 4 ins; 4 del; 4 mod
  Patch: https://git.openjdk.java.net/loom/pull/94.diff
  Fetch: git fetch https://git.openjdk.java.net/loom pull/94/head:pull/94

PR: https://git.openjdk.java.net/loom/pull/94