JIT: Remove implicit fallthrough assumption in fgExpandRarelyRunBlocks
#107350
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cc @dotnet/jit-contrib, @AndyAyersMS PTAL. Diffs show some flowgraph churn, with misleadingly-large PerfScore regressions since we're no longer incorrectly marking |
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I noticed this while looking at the diffs for #107175. I also removed the compaction logic since it had zero diffs:
fgExpandRarelyRunBlocksis only called byfgReorderBlocks, which is always preceded by a pass offgUpdateFlowGraph.