RFR: 8252695: Shenandoah: clean up Graal enabled/disabled filter in tests [v2]

[Aleksey Shipilev]

> Drop `!vm.graal.enabled` since it is not required after JDK-8249000.

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Fix some missing tests too

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/51/files
  - new: https://git.openjdk.java.net/jdk/pull/51/files/68d210a6..a5a5967c

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=51&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=51&range=00-01

  Stats: 7 lines in 4 files changed: 0 ins; 0 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk/pull/51.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/51/head:pull/51

PR: https://git.openjdk.java.net/jdk/pull/51