compiler: Move impl of ToJson for abi::Endian

compiler/rustc_target/src/abi/mod.rs

@@ -6,19 +6,11 @@ use Primitive::*;
 use rustc_data_structures::intern::Interned;
 use rustc_macros::HashStable_Generic;
 
-use crate::json::{Json, ToJson};
-
 pub mod call;
 
 // Explicitly import `Float` to avoid ambiguity with `Primitive::Float`.
 pub use rustc_abi::{Float, *};
 
-impl ToJson for Endian {
-    fn to_json(&self) -> Json {
-        self.as_str().to_json()
-    }
-}
-
 rustc_index::newtype_index! {
     /// The *source-order* index of a field in a variant.
     ///

compiler/rustc_target/src/json.rs

@@ -134,3 +134,9 @@ impl ToJson for TargetMetadata {
         })
     }
 }
+
+impl ToJson for rustc_abi::Endian {
+    fn to_json(&self) -> Json {
+        self.as_str().to_json()
+    }
+}