cranelift: Support bool vectors in trampoline

cranelift/codegen/src/ir/types.rs

@@ -127,6 +127,21 @@ impl Type {
         }
     }
 
+    /// Get a type with the same number of lanes as this type, but with the lanes replaced by
+    /// integers of the same size.
+    ///
+    /// Scalar types follow this same rule, but `b1` is converted into `i8`
+    pub fn as_int(self) -> Self {
+        self.replace_lanes(match self.lane_type() {
+            B1 | B8 => I8,
+            B16 => I16,
+            B32 => I32,
+            B64 => I64,
+            B128 => I128,
+            _ => unimplemented!(),
+        })
+    }
+
     /// Get a type with the same number of lanes as this type, but with lanes that are half the
     /// number of bits.
     pub fn half_width(self) -> Option<Self> {
@@ -530,4 +545,13 @@ mod tests {
         assert_eq!(I32X4.as_bool_pedantic(), B32X4);
         assert_eq!(I32.as_bool_pedantic(), B32);
     }
+
+    #[test]
+    fn as_int() {
+        assert_eq!(B32X4.as_int(), I32X4);
+        assert_eq!(B8X8.as_int(), I8X8);
+        assert_eq!(B1.as_int(), I8);
+        assert_eq!(B8.as_int(), I8);
+        assert_eq!(B128.as_int(), I128);
+    }
 }