[DNM] Parser attempt to Fallthrough Problem #23056
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gottesmm
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…iple cast items. There was a bug here where we were emitting a shared case if we had arguments. That is why we needed the hacked in deletion of that block when we emitted shared blocks. I was able to replace that with an assert to make sure that we do not regress. This additionally improved our code generation by eliminating a potential extra copy when we had such a case. That is where the test updates come from.
…hose var decls for anything. Intermediate step towards fixing the multiple fallthrough + associated value bug. With these, all of the weird problems with SILGen pattern fallthroughs go away since all case bodies will have their own var decls. rdar://47467128
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