Update bool-cmp.rs codegen

Author: nikic

src/test/codegen/bool-cmp.rs

@@ -10,8 +10,9 @@ use std::cmp::Ordering;
 // CHECK-LABEL: @cmp_bool
 #[no_mangle]
 pub fn cmp_bool(a: bool, b: bool) -> Ordering {
+// LLVM 10 produces (zext a) + (sext b), but the final lowering is (zext a) - (zext b).
 // CHECK: zext i1
-// CHECK: zext i1
-// CHECK: sub nsw
+// CHECK: {{z|s}}ext i1
+// CHECK: {{sub|add}} nsw
     a.cmp(&b)
 }