This PR fixes an IR mismatch in `TestLWorld.java` for `test85` and `test86`. When merging jdk-26+17, there were some changes to `G1BarrierSetC2::estimated_barrier_size` due to [JDK-8342382](https://bugs.openjdk.org/browse/JDK-8342382). The barrier size is significantly reduced, opening the door to more unrolling as per `IdealLoopTree::policy_unroll`. In the specific case of `test85` and `test86`, this leads to unrolling where there previously was none and splitting a `CountedLoop` into a main and post loop. This breaks the IR rules because they rely on exact nodes count.
For `test86`, we can trivially replace `COUNTED_LOOP` by `COUNTED_LOOP_MAIN` to avoid counting the loop twice. For `test85`, we also have a check on `LOAD_UNKNOWN_INLINE`, which ends up being appearing four times in the default setup (because of unrolling and pre/main/post). This is a bit annoying. It seems the best solution in this case is to check the IR right before the pre/main/post, that is at `PHASEIDEALLOOP2`. ### Testing - [x] GitHub Actions - [x] tier1-4 for this specific test, plus some internal testing Thank you for reviewing! ------------- Commit messages: - Match test85 in PHASEIDEALLOOP2 to avoid duplicaint load_unkown_inline - Fix the test by specifying 'main' loop and changing count for LOAD_UNKOWN_INLINE - Reenable IR rules Changes: https://git.openjdk.org/valhalla/pull/2219/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2219&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8370070 Stats: 6 lines in 1 file changed: 2 ins; 0 del; 4 mod Patch: https://git.openjdk.org/valhalla/pull/2219.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2219/head:pull/2219 PR: https://git.openjdk.org/valhalla/pull/2219
