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Jake Bailey
27f8ec17fc
Track whether an allocation reaches a callee return separately from the
instruction where it escapes. The extra result state is needed because LLVM's
returned parameter attribute only covers scalar returns: a slice helper returns
its data pointer inside a {ptr, len, cap} aggregate, so the alias is only
visible by walking insertvalue and ret uses in the callee.
This lets OptimizeAllocs keep the backing array for returnIntSlice(s) on the
stack when the returned slice is ignored, matching gc's escape decision for the
same pattern. The golden output still keeps the escaping returned-slice case on
the heap.