Backport "Fix Expr(:loopinfo) codegen" #51883
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We used a loop-marker intrinsic because the LoopID used to be dropped by optimization passes (this seems no longer true). got optimized by simplifycfg to the point where the loop-marker is now attached to the wrong back-edge. This PR drops the loop-marker and uses the LoopID metadata node directly. (cherry picked from commit 90494c2)
brenhinkeller
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compiler:codegen
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Backport #50663 to 1.10