std: Rename {Eq,Ord} to Partial{Eq,Ord}

This is part of the ongoing renaming of the equality traits. See #12517 for more
details. All code using Eq/Ord will temporarily need to move to Partial{Eq,Ord}
or the Total{Eq,Ord} traits. The Total traits will soon be renamed to {Eq,Ord}.

cc #12517

[breaking-change]

src/libregex/parse/mod.rs

@@ -67,7 +67,7 @@ pub enum Ast {
     Rep(Box<Ast>, Repeater, Greed),
 }
 
-#[deriving(Show, Eq, Clone)]
+#[deriving(Show, PartialEq, Clone)]
 pub enum Repeater {
     ZeroOne,
     ZeroMore,