RFR: 8280378: [IR Framework] Support IR matching for different compile phases [v3]

[Christian Hagedorn]

On Fri, 14 Oct 2022 09:02:29 GMT, Roberto Castañeda Lozano <rcastanedalo at openjdk.org> wrote:

> Thanks for implementing this useful feature, Christian! I have tried it out again for my use case ([barrier elision tests for generational ZGC](https://github.com/robcasloz/zgc/tree/barrier-elision-tests)) and it works fine. I have also tested different combinations of phases and IR nodes and the tests pass/fail as expected. Nice that you added extensive tests for the IR framework itself (`test/hotspot/jtreg/testlibrary_tests/ir_framework`). I only have some minor comments and suggestions.

Thanks a lot Roberto for your review and re-testing the current state again with your ZGC branch and playing around with different compile phases! I've pushed updates with your review comments.

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PR: https://git.openjdk.org/jdk/pull/10695