JIT: split loop headers that are also try entries #110880
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when there are backedges that have exited the try. This allows the preheader and header to be in the same EH region and may unblock other optimizations. This is done by splitting the header block and making the trailing portion be the try entry. Perform a mid (or end) block split if the initial (or all) statements in the header cannot throw. Fixes dotnet#96887. Enable cloning of loops with EH.
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when there are backedges that have exited the try. This allows the preheader and header to be in the same EH region and may unblock other optimizations.
This is done by splitting the header block and making the trailing portion be the try entry. Perform a mid (or end) block split if the initial (or all) statements in the header cannot throw.
Fixes #96887.
Enable cloning of loops with EH.