[CIR] Unblock simple C++ structure support (#138368) This change adds additional checks to a few places where a simple struct in C++ code was triggering `errorNYI` in places where no additional handling was needed, and adds a very small amount of trivial initialization. The code now checks for the conditions that do require extra handling before issuing the diagnostic. New tests are added for declaring and using a simple struct in C++ code.
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