Add tests that fail.

Author: bshastry

test/libyul/yulOptimizerTests/fullSimplify/scoped_var_ref_in_function_call.yul

@@ -0,0 +1,23 @@
+{
+    function f(x) {}
+    let x
+    {
+        x := add(1, calldataload(0))
+    }
+    f(call(2, 0, 1, mod(x, 8), 1, 1, 1))
+}
+// ----
+// step: fullSimplify
+//
+// {
+//     {
+//         let x_1
+//         {
+//             let _2 := calldataload(x_1)
+//             let _3 := 1
+//             x_1 := add(_3, _2)
+//         }
+//         let _4 := 1
+//         pop(call(2, 0, _4, addmod(_3, _2, 8), _4, _4, _4))
+//     }
+// }

test/libyul/yulOptimizerTests/loadResolver/scoped_var_ref_in_keccak.yul

@@ -0,0 +1,22 @@
+{
+    let x
+    {
+        let y := msize()
+        x := add(4, y)
+    }
+    x := keccak256(0, mod(x, 2))
+}
+// ----
+// step: loadResolver
+//
+// {
+//     {
+//         let x
+//         {
+//             let y := msize()
+//             let _1 := 4
+//             x := add(_1, y)
+//         }
+//         x := keccak256(0, addmod(_1, y, 2))
+//     }
+// }