Invalid deepcopy generation for pointers to map type aliases

[norbertcyran]

With types like these:

type MapAlias map[string]string  // any map would work

type Foo struct {
  Bar *MapAlias
}

DeepCopyInto for Foo is generated with a type error:

...
*out = new(map[string]string)  // incompatible types - expected MapAlias, got map[string]string

while instead it should generate:

*out = new(MapAlias)

Looks like this line is the culprit:

controller-tools/pkg/deepcopy/traverse.go

Line 546 in cf302a3

c.Linef("*out = new(%s)", (&namingInfo{typeInfo: underlyingElem}).Syntax(c.pkg, c.importsList))

However, I'm not sure if the fix is as simple as replacing underlyingElem with pointerType.Elem(). I guess there was a reason why this line looks different than the previous if block

Similar to #586