[jdk8u-dev] RFR: 8296555: Enable hotspot/tier1 for 64-bit builds in GHA for 8u

[zzambers]

It is now possible to enable hostspot/tier1 in Github Actions at least for 64-bit builds as problematic compiler/rcm tests have been problem listed [1]. So far only for 64-bit builds, as there are still some tests failing for 32-bit builds, which need to be fixed, before it (hotspot/tier1) can be enabled there.

All tests passed.

[1] https://bugs.openjdk.org/browse/JDK-8295915

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Commit messages:
 - Enable hotspot/tier1 for 64-bit builds in GHA for 8u

Changes: https://git.openjdk.org/jdk8u-dev/pull/163/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=163&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8296555
  Stats: 9 lines in 1 file changed: 0 ins; 0 del; 9 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/163.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/163/head:pull/163

PR: https://git.openjdk.org/jdk8u-dev/pull/163