JIT: Delay creation of scratch block needed by backend #110396
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The frontend created a scratch BB required by the backend. Having a long term invariant like this seems unnecessary; instead create the scratch BB in lowering to shorten the time we have this invariant.
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This was referenced Dec 4, 2024
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The frontend created a scratch BB required by the backend. Having a long term invariant like this seems unnecessary; instead create the scratch BB in lowering to shorten the time we have this invariant.
Motivation: dotnet/runtimelab#2847 (comment)
I think it would be better to guarantee a scratch BB throughout the JIT pipeline (we have discussed this before), but I think that should come with debug checks and seemed like it might also come with diffs, so I didn't want to do it here.