Add create & delete array tests for yul

test/libsolidity/semanticTests/array/create_memory_array.sol

@@ -16,6 +16,7 @@ contract C {
         return (x[199], y[203][1], z[170].a[1], z[170].b[99]);
     }
 }
-
+// ====
+// compileViaYul: also
 // ----
 // f() -> "A", 8, 4, "B"

test/libsolidity/semanticTests/array/delete_memory_array.sol

@@ -0,0 +1,17 @@
+contract C {
+
+    function len() public returns (uint ret) {
+        uint[] memory data = new uint[](2);
+        data[0] = 234;
+        data[1] = 123;
+        delete data;
+        assembly {
+            ret := mload(data)
+        }
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// len() -> 0

test/libsolidity/semanticTests/array/delete_storage_array.sol

@@ -0,0 +1,40 @@
+contract C {
+    uint[] data;
+
+    function len() public returns (uint ret) {
+        data.push(234);
+        data.push(123);
+        delete data;
+        assembly {
+            ret := sload(data_slot)
+        }
+    }
+
+    function val() public returns (uint ret) {
+        assembly {
+            sstore(0, 2)
+            mstore(0, 0)
+            sstore(keccak256(0, 32), 234)
+            sstore(add(keccak256(0, 32), 1), 123)
+        }
+
+        assert(data[0] == 234);
+        assert(data[1] == 123);
+
+        delete data;
+
+        uint size = 999;
+
+        assembly {
+            size := sload(0)
+            mstore(0, 0)
+            ret := sload(keccak256(0, 32))
+        }
+    }
+}
+
+// ====
+// compileViaYul: also
+// ----
+// len() -> 0
+// val() -> 0