FileCheck bad_op_mod_by_zero.

tests/mir-opt/const_prop/bad_op_mod_by_zero.rs

@@ -1,9 +1,16 @@
-// skip-filecheck
 // unit-test: ConstProp
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
+
 // EMIT_MIR bad_op_mod_by_zero.main.ConstProp.diff
 #[allow(unconditional_panic)]
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: debug y => [[y:_.*]];
+    // CHECK: debug _z => [[z:_.*]];
+    // CHECK: assert(!const true, "attempt to calculate the remainder of `{}` with a divisor of
+    // zero", const 1_i32)
+    // CHECK: assert(!const false, "attempt to compute the remainder of `{} % {}`, which would overflow", const 1_i32, const 0_i32)
+    // CHECK: [[z]] = Rem(const 1_i32, const 0_i32);
     let y = 0;
     let _z = 1 % y;
 }