RFR: CODETOOLS-7902865: jcstress: Enable -XX:+DebugNonSafepoints if available to get more verbose disassembly

[Aleksey Shipilev]

CODETOOLS-7902854 added support for printing disassembly. Unfortunately, supplying PrintAssembly through compiler directives does not implicitly enables -XX:+DebugNonSafepoints, which makes disassembly less verbose: it misses PcDescs for non-safepoints.

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Commit messages:
 - CODETOOLS-7902865: jcstress: Enable -XX:+DebugNonSafepoints if available to get more verbose disassembly

Changes: https://git.openjdk.java.net/jcstress/pull/21/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jcstress&pr=21&range=00
  Issue: https://bugs.openjdk.java.net/browse/CODETOOLS-7902865
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jcstress/pull/21.diff
  Fetch: git fetch https://git.openjdk.java.net/jcstress pull/21/head:pull/21

PR: https://git.openjdk.java.net/jcstress/pull/21