go/tools/gopackagesdriver: pass Compiler and Arch in DriverResponse #3657
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go/packages is being changed to expect Compiler and Arch in its DriverResponse (see golang.org/cl/516917) because we can't expect the type of the types.Sizes returned by types.Sizes to be types.StdSizes. (The default it uses when Compiler and Arch aren't set is the set of types for gc,amd64, so there's no change in behavior if those fields aren't set, but we should set them. I'd also like to see if we can correctly provide the arch assuming it's not amd64. I left a question in the code asking about that.
For #3656