8343173: Remove ZGC-specific non-JVMCI test groups

[lmesnik]

The JVMCI should be supported by all GCs and specific
hotspot_compiler_all_gcs
group is not needed anymore.

There are few failures of JVMCI tests with ZGC happened, the bug
https://bugs.openjdk.org/browse/JDK-8343233
is filed and corresponding tests are problemlisted.

---

Progress

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• Commit message must refer to an issue

Issue

• JDK-8343173: Remove ZGC-specific non-JVMCI test groups (Enhancement - P4)

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[openjdk]

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[mlbridge]

Webrevs

• 00: Full (e8c3e4ef)

[lmesnik]

/cc hotspot-compiler
/cc hotspot-gc

[openjdk]

@lmesnik
The hotspot-compiler label was successfully added.

[openjdk]

@lmesnik
The hotspot-gc label was successfully added.