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Part of #107749. Removes the last "TODO-NoFallThrough" in the JIT source. During switch recognition, we should only need to modify flow edges -- changing the lexical order of blocks to create fallthrough into one of the switch's successors is unnecessary, now that we're running block layout in the backend.

@ghost ghost added the area-CodeGen-coreclr CLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMI label Nov 13, 2024
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cc @dotnet/jit-contrib, @AndyAyersMS PTAL. Small diffs. Thanks!

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/azp run runtime-coreclr jitstress, runtime-coreclr libraries-jitstress

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ping @dotnet/jit-contrib, CI failures are #109745 and #109499 -- thanks!

@amanasifkhalid amanasifkhalid merged commit 7eecb04 into dotnet:main Nov 19, 2024
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@amanasifkhalid amanasifkhalid deleted the switch-fallthrough-quirk branch November 19, 2024 21:56
mikelle-rogers pushed a commit to mikelle-rogers/runtime that referenced this pull request Dec 10, 2024
Part of dotnet#107749. Removes the last "TODO-NoFallThrough" in the JIT source. During switch recognition, we should only need to modify flow edges -- changing the lexical order of blocks to create fallthrough into one of the switch's successors is unnecessary, now that we're running block layout in the backend.
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