RFR: 8208257: [mlvm] Add randomness keyword to vm/mlvm/meth/func/jdi/breakpointOtherStratum

[Evgeny Nikitin]

Pre-Scara thread: [link](https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-August/039557.html).

I tried to reproduce the test multiple times with different VM parameters, but it always passes. I suggest removing it
from ProblemList.txt.

Second change is marking the test with randomness keyword from the
[JDK-8243427](https://bugs.openjdk.java.net/browse/JDK-8243427) (using reproducible random for mlvm tests).

Tested using mach5 on the 4 platforms, 50 runs each.

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Commit messages:
 - 8208257: [mlvm] Add randomness keyword to vm/mlvm/meth/func/jdi/breakpointOtherStratum

Changes: https://git.openjdk.java.net/jdk/pull/309/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=309&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8208257
  Stats: 2 lines in 2 files changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/309.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/309/head:pull/309

PR: https://git.openjdk.java.net/jdk/pull/309