JDK21 compiler debug build fails due to assertion omr/compiler/x/codegen/OMRRegisterDependency.hpp:208: newCursor <= _numPostConditions about openj9 HOT 1 OPEN

I thought I'd investigate this a little, and I noticed that PR #19514 changes J9TreeEvaluator.cpp a bit.

1. If I try to build a debug JDK (JDK21, on xlinux) with relatively recent commits (d2b02cf and eclipse/omr@330a128) and with the change in #19856 cherry-picked, the build fails with the assert I reported in this issue.
2. If I then revert 204fc71...b767300, I still get the assert.
3. If I then revert 204fc71 itself, the assert disappears and the debug build succeeds in building.

So, I think it might be 204fc71 that's the issue. I don't know much about the dependency tracking that's done here, but I wonder if @0xdaryl (or someone else) might be able to see what's going wrong.

(EDIT: That commit 204fc71 was responsible for removing two ¬ characters in J9TreeEvaluator.cpp introduced in an earlier commit in that PR, so I did also have to delete them manually for the build to succeed in 3.)

from openj9.