22e40cc7fe
Previous CLs add new language constructs in Go 1.17, specifically, unsafe.Add, unsafe.Slice, and conversion from a slice to a pointer to an array. This CL handles them in the escape analysis. At the point of the escape analysis, unsafe.Add and unsafe.Slice are still builtin calls, so just handle them in data flow. Conversion from a slice to a pointer to an array has already been lowered to a combination of compound expression, conditional expression and slice info expressions, so handle them in the escape analysis. Reviewed-on: https://go-review.googlesource.com/c/gofrontend/+/339671
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