add AllocConst impl for StackLayout

This allows to use StackLayout as parameter to try_into_cmp_branch_instr ext-trait method.

Author: Robbepop

crates/wasmi/src/engine/translator/func2/layout/mod.rs

@@ -4,7 +4,7 @@ use self::consts::{ConstRegistry, ConstRegistryIter};
 use super::{LocalIdx, Operand, OperandIdx, Reset};
 use crate::{
     core::{UntypedVal, ValType},
-    engine::TranslationError,
+    engine::{translator::comparator::AllocConst, TranslationError},
     ir::Reg,
     Error,
 };
@@ -127,6 +127,12 @@ impl StackLayout {
     }
 }
 
+impl AllocConst for StackLayout {
+    fn alloc_const<T: Into<UntypedVal>>(&mut self, value: T) -> Result<Reg, Error> {
+        self.const_to_reg(value)
+    }
+}
+
 /// The [`StackSpace`] of a [`Reg`].
 #[derive(Debug, Copy, Clone)]
 pub enum StackSpace {