RFR: 8315969: compiler/rangechecks/TestRangeCheckHoistingScaledIV.java: make flagless

[Evgeny Nikitin]

A recent improvement ([JDK-8314838](https://bugs.openjdk.org/browse/JDK-8314838)) changed dependant VM creation in that test - we now forward given arguments via 'ProcessTools.createTestJvm()'. It has been revealed, however, that the test doesn't work well with '-Xcomp'. A bug ([JDK-8316124](https://bugs.openjdk.org/browse/JDK-8316124)) has been filed.

I suggest to temporarily make test 'vm.flagless' to allow for running the test in CI. As soon as [JDK-8316124](https://bugs.openjdk.org/browse/JDK-8316124) is fixed, we'll remove that limitation.

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Commit messages:
 - 8315969: compiler/rangechecks/TestRangeCheckHoistingScaledIV.java: make flagless

Changes: https://git.openjdk.org/jdk/pull/16746/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16746&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8315969
  Stats: 4 lines in 2 files changed: 1 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk/pull/16746.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16746/head:pull/16746

PR: https://git.openjdk.org/jdk/pull/16746