go/doc: removed unused field "Type.Type"

CL 5572043 removed the last uses of this field.
The information is readily available from Type.Decl.

R=rsc, golang-dev
CC=golang-dev
https://golang.org/cl/5570049

src/pkg/go/doc/doc.go

@@ -17,11 +17,13 @@ type Package struct {
 	ImportPath string
 	Imports    []string
 	Filenames  []string
+	Bugs       []string
+
+	// declarations
 	Consts []*Value
 	Types  []*Type
 	Vars   []*Value
 	Funcs  []*Func
-	Bugs       []string
 }
 
 // Value is the documentation for a (possibly grouped) var or const declaration.
@@ -44,8 +46,9 @@ type Method struct {
 type Type struct {
 	Doc  string
 	Name string
-	Type    *ast.TypeSpec
 	Decl *ast.GenDecl
+
+	// associated declarations
 	Consts  []*Value  // sorted list of constants of (mostly) this type
 	Vars    []*Value  // sorted list of variables of (mostly) this type
 	Funcs   []*Func   // sorted list of functions returning this type

src/pkg/go/doc/reader.go

@@ -520,7 +520,6 @@ func (doc *docReader) makeTypes(m map[string]*typeInfo) []*Type {
 				}
 				decl.Doc = nil // doc consumed - remove from ast.Decl node
 				t.Doc = doc.Text()
-				t.Type = typespec
 			}
 			t.Consts = makeValues(old.values, token.CONST)
 			t.Vars = makeValues(old.values, token.VAR)