[IRGen] Apply correct type to conversion for direct values and erorrs… #79369
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… with typed throws
rdar://144719032
When converting the combined result back to the actual types when directly returning typed errors, in case the error or result value was a single value smaller then pointer size and the combined value was larger, the value was converted to the combined type instead of the actual type, making it a no-op, which caused undefined behavior when writing the value to the coerced alloca.