cranelift: Generate the correct souper size for comparisons in LHSes (#5659)

cranelift/codegen/src/souper_harvest.rs

@@ -528,9 +528,16 @@ fn souper_type_of(dfg: &ir::DataFlowGraph, val: ir::Value) -> Option<ast::Type>
     let ty = dfg.value_type(val);
     assert!(ty.is_int());
     assert_eq!(ty.lane_count(), 1);
-    Some(ast::Type {
-        width: ty.bits().try_into().unwrap(),
-    })
+    let width = match dfg.value_def(val).inst() {
+        Some(inst)
+            if dfg.insts[inst].opcode() == ir::Opcode::IcmpImm
+                || dfg.insts[inst].opcode() == ir::Opcode::Icmp =>
+        {
+            1
+        }
+        _ => ty.bits().try_into().unwrap(),
+    };
+    Some(ast::Type { width })
 }
 
 #[derive(Debug)]