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Ensure edge likelihoods 3 #99460

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AndyAyersMS
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FYI @amanasifkhalid -- getting close to the end.

@dotnet-issue-labeler dotnet-issue-labeler bot added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Mar 8, 2024
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@AndyAyersMS
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Going to push a fix for the above failures separately -- RBO is creating a degenerate branch.

Detect if the update has created degenerate BBJ_COND flow, and simplify.
Also symmetrize the true/false cases.

Fixes dotnet#48609.

Also fixes some issues seen in enhanced likelhood checking.
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Superseded by #99541

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