Remove a couple of unused Encodable and Decodable derives

Author: bjorn3

compiler/rustc_target/src/abi/mod.rs

@@ -574,7 +574,7 @@ impl Align {
 }
 
 /// A pair of alignments, ABI-mandated and preferred.
-#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug, Encodable, Decodable)]
+#[derive(Copy, Clone, PartialEq, Eq, Hash, Debug)]
 #[derive(HashStable_Generic)]
 pub struct AbiAndPrefAlign {
     pub abi: Align,

compiler/rustc_target/src/spec/mod.rs

@@ -211,7 +211,7 @@ impl ToJson for PanicStrategy {
     }
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable)]
+#[derive(Clone, Copy, Debug, PartialEq, Hash)]
 pub enum RelroLevel {
     Full,
     Partial,
@@ -255,7 +255,7 @@ impl ToJson for RelroLevel {
     }
 }
 
-#[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable)]
+#[derive(Clone, Copy, Debug, PartialEq, Hash)]
 pub enum MergeFunctions {
     Disabled,
     Trampolines,