Sort the list of instruction formats by name

This makes opcodes.rs and inst_builders.rs deterministic.

cranelift/codegen/meta/src/shared/mod.rs

@@ -92,6 +92,8 @@ impl Definitions {
             }
         }
 
-        Vec::from_iter(format_structures.into_iter().map(|(_, v)| v))
+        let mut result = Vec::from_iter(format_structures.into_iter().map(|(_, v)| v));
+        result.sort_by_key(|format| format.name);
+        result
     }
 }