swift

4d45efd2 - Update getParamDeclFromOperand to find pack params

Update getParamDeclFromOperand to find pack params Create utility that can find the pack that will be copied into AllocStackInst, and use it to find the parameter declaration from the alloc stack operand that gets flagged as escaping noescape. I have some concern about this changing how checkapply determines what to look at, but I think it should be more correct to recognize alloc stack for a pack as potentially escaping with a parameter?