Remove the cfg(stageN)-specific serialize code.

Author: erickt

src/librustc/metadata/decoder.rs

@@ -25,10 +25,6 @@ use reader = std::ebml::reader;
 use std::ebml;
 use std::map::HashMap;
 use std::map;
-#[cfg(stage0)]
-use std::serialize::traits::Decodable;
-#[cfg(stage1)]
-#[cfg(stage2)]
 use std::serialize::Decodable;
 use syntax::ast_map;
 use syntax::attr;

src/librustc/middle/astencode.rs

@@ -29,10 +29,6 @@ use std::ebml;
 use std::map::HashMap;
 use std::serialize;
 use std::serialize::{Encodable, EncoderHelpers, DecoderHelpers};
-#[cfg(stage0)]
-use std::serialize::traits::Decodable;
-#[cfg(stage1)]
-#[cfg(stage2)]
 use std::serialize::Decodable;
 use syntax::ast;
 use syntax::ast_map;