[jdk8u-dev] RFR: 8152432: Implement setting jtreg @requires properties vm.flavor, vm.bits, vm.compMode

[Zdenek Zambersky]

This is backport[1][2] of code adds support for jtreg vm properties (`vm.flavor`, `vm.compMode`, `vm.bits`) for use in `@requires` 

First commit is backport Itself.

Second commit switches some tests back to use `@requires` (2 are basically reverts [3][4] of jdk8u specific changes, 3rd updated test is not present in newer jdks [5][6])
These updated tests were used to test new properties, so I included them here. (However I can exclude them if requested)

Testing:
Updated tests are part of hotspot tier1, which is executed in GitHub (Which confirms it works).

[1] https://github.com/openjdk/jdk9u/commit/24a9e0ac188a37dc57cc4d1bb8d8635abb4c4f89
[2] https://github.com/openjdk/jdk9u/commit/2b7a70a9d3d9b4ca94605d22d3d4f3c78a5c8d8b
[3] https://github.com/openjdk/jdk8u-dev/pull/222
[4] https://github.com/openjdk/jdk8u-dev/pull/182
[5] https://bugs.openjdk.org/browse/JDK-8154204
[6] https://github.com/openjdk/jdk8u-dev/pull/181

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Commit messages:
 - Switch few tests (back) to uses @requires
 - 8152432: Implement setting jtreg @requires properties vm.flavor, vm.bits, vm.compMode

Changes: https://git.openjdk.org/jdk8u-dev/pull/286/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk8u-dev&pr=286&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8152432
  Stats: 161 lines in 5 files changed: 145 ins; 14 del; 2 mod
  Patch: https://git.openjdk.org/jdk8u-dev/pull/286.diff
  Fetch: git fetch https://git.openjdk.org/jdk8u-dev pull/286/head:pull/286

PR: https://git.openjdk.org/jdk8u-dev/pull/286