RFR: 8271118: C2: StressGCM should have higher priority than frequency-based policy

[Vladimir Kozlov]

On Thu, 22 Jul 2021 05:34:40 GMT, Yi Yang <yyang at openjdk.org> wrote:

> I think StressGCM should have higher priority than frequency-based policy, otherwise StressGCM has no chance to choose because the frequency-based policy would choose block first if appropriately.

If you want `StressGCM` flag fully control placement you need to do next:


  if (StressGCM && C->randomized_select(cand_cnt)) ||
      !StressGCM && ( // all other checks


Your current changes do nothing logically.

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Changes requested by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/4865