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Segfault inside JIT in libraries-jitstress #68756

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@jakobbotsch

The libraries-jitstress job is hitting AVs/segfaults in a few tests, e.g. https://dev.azure.com/dnceng/public/_build/results?buildId=1746194&view=ms.vss-test-web.build-test-results-tab&runId=47150832&resultId=193742&paneView=debug.

It seems curBlk is null here:

if (curBlk->bbNum > endBlk->bbNum)

which happens because endBlk is lexically before begBlk.

From bisection it was exposed by #68588.
cc @dotnet/jit-contrib

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    area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIneeds-further-triageIssue has been initially triaged, but needs deeper consideration or reconsideration

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