FileCheck tuple_literal_propagation.

Author: cjgillot

tests/mir-opt/const_prop/tuple_literal_propagation.rs

@@ -1,10 +1,11 @@
-// skip-filecheck
 // unit-test: ConstProp
 // EMIT_MIR_FOR_EACH_PANIC_STRATEGY
 // EMIT_MIR tuple_literal_propagation.main.ConstProp.diff
+
 fn main() {
+    // CHECK-LABEL: fn main(
+    // CHECK: = consume(const (1_u32, 2_u32))
     let x = (1, 2);
-
     consume(x);
 }