RFR: 7903655: jcstress: Support StressMacroExpansion stress option

[Aleksey Shipilev]

[JDK-8317349](https://bugs.openjdk.org/browse/JDK-8317349) added a new randomization option for C2, we would like to take it for jcstress, like other C2 stress options.

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Commit messages:
 - Fix

Changes: https://git.openjdk.org/jcstress/pull/145/files
 Webrev: https://webrevs.openjdk.org/?repo=jcstress&pr=145&range=00
  Issue: https://bugs.openjdk.org/browse/CODETOOLS-7903655
  Stats: 6 lines in 1 file changed: 6 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jcstress/pull/145.diff
  Fetch: git fetch https://git.openjdk.org/jcstress.git pull/145/head:pull/145

PR: https://git.openjdk.org/jcstress/pull/145