Hi, This PR backs out the changes in #2066. While the failure is due to the dead `MergeMemNode` not collected by igvn, investigating the issue reveals to me that with `-XX:+StressReflectiveCode`, `GraphKit::gen_checkcast` can buffer the `InlineTypeNode`. This is unexpected as the code in `InlineTypeNode::emit_substitutability_check` does not expect the expansion to generate new memory nodes.
Please review, thanks a lot. ------------- Commit messages: - Revert "8377414: [lworld] Improve acmp expansion" Changes: https://git.openjdk.org/valhalla/pull/2080/files Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2080&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8377680 Stats: 571 lines in 7 files changed: 91 ins; 377 del; 103 mod Patch: https://git.openjdk.org/valhalla/pull/2080.diff Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2080/head:pull/2080 PR: https://git.openjdk.org/valhalla/pull/2080
