Fix coreView looking through newtype's
Fix coreView looking through newtype's

Somehow, there was code that only looked through newtypes of the
forms:

* newtype Age   = Age Int
* newtype Foo a = Foo (Bar a a)

But couldn't look through newtypes of the form

* newtype Foo a = Maybe a

That is fixed now

ggreif/clash-compiler,ggreif/clash-compiler