[region-isolation] Implement support for 'inout sending' diagnostics. #74919
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…so we can attach a Kind and propagate it. The reason why I am doing this is that I am adding support for failing to reinitialize an inout sending parameter that was transferred. To make it really easy to do I am just going to explicitly represent this on the RequireInst and let the decision on what diagnostic to be done to be represented in the pseudo-IR instead of trying to just infer it straight from the type of require inst. This keeps all of the logic in the same place and attempts to keep the diagnostic emitter not use logic and instead just emit. This is NFC so I can make sure that things work before adding the additional code.
Specifically: 1. We error now if one transfers an 'inout sending' parameter and does not reinitialize it before the end of the function. 2. We error now if one merges an 'inout sending' parameter into an actor isolated region and do not reinitialize it with a non-actor isolated value before the end of the function. rdar://126303739
gottesmm
requested review from
ktoso,
hborla,
slavapestov and
xedin
as code owners
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rdar://126303739