Add enum variants to the type namespace

Change to resolve and update compiler and libs for uses.

[breaking-change]

Enum variants are now in both the value and type namespaces. This means that
if you have a variant with the same name as a type in scope in a module, you
will get a name clash and thus an error. The solution is to either rename the
type or the variant.

src/librustc/util/ppaux.rs

@@ -962,10 +962,10 @@ impl Repr for typeck::MethodOrigin {
             &typeck::MethodStaticUnboxedClosure(def_id) => {
                 format!("MethodStaticUnboxedClosure({})", def_id.repr(tcx))
             }
-            &typeck::MethodParam(ref p) => {
+            &typeck::MethodTypeParam(ref p) => {
                 p.repr(tcx)
             }
-            &typeck::MethodObject(ref p) => {
+            &typeck::MethodTraitObject(ref p) => {
                 p.repr(tcx)
             }
         }