Inline some encoding and decoding methods.

This is a small performance win.

src/librustc/ty/codec.rs

@@ -301,6 +301,7 @@ where
 macro_rules! __impl_decoder_methods {
     ($($name:ident -> $ty:ty;)*) => {
         $(
+            #[inline]
             fn $name(&mut self) -> Result<$ty, Self::Error> {
                 self.opaque.$name()
             }

src/librustc/ty/query/on_disk_cache.rs

@@ -943,6 +943,7 @@ where
 
 macro_rules! encoder_methods {
     ($($name:ident($ty:ty);)*) => {
+        #[inline]
         $(fn $name(&mut self, value: $ty) -> Result<(), Self::Error> {
             self.encoder.$name(value)
         })*