[jitstress] JIT\Regression\JitBlue\Runtime_90423 fails with "Assertion failed '(op2 == idx) || (op2->gtEffectiveVal() == idx)' during 'Find oper order'"

[jakobbotsch]

jitstress is red due to this assertion failure: https://dev.azure.com/dnceng-public/public/_build?definitionId=109&_a=summary
Example console log: https://helixre107v0xdcypoyl9e7f.blob.core.windows.net/dotnet-runtime-refs-pull-103559-merge-65fba342677a469aac/Regression_2/1/console.ff49ede3.log?helixlogtype=result

cc @dotnet/jit-contrib

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[jakobbotsch]

Bisected to #99183, so probably something that was just exposed by that change...

[amanasifkhalid]

@EgorBo I'm seeing this assert hit again in #103904, though I don't think it was exposed by block compaction since it's hitting in MinOpts.