Derive serde traits for TrapCode

cranelift/codegen/src/ir/trapcode.rs

@@ -2,11 +2,14 @@
 
 use core::fmt::{self, Display, Formatter};
 use core::str::FromStr;
+#[cfg(feature = "enable-serde")]
+use serde::{Deserialize, Serialize};
 
 /// A trap code describing the reason for a trap.
 ///
 /// All trap instructions have an explicit trap code.
 #[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
+#[cfg_attr(feature = "enable-serde", derive(Serialize, Deserialize))]
 pub enum TrapCode {
     /// The current stack space was exhausted.
     ///