Moving some more array tests to semanticTests.

test/libsolidity/semanticTests/array/delete/memory_arrays_delete.sol

@@ -0,0 +1,15 @@
+contract Test {
+    function del() public returns (uint24[3][4] memory) {
+        uint24[3][4] memory x;
+        for (uint24 i = 0; i < x.length; i ++)
+            for (uint24 j = 0; j < x[i].length; j ++)
+                x[i][j] = i * 0x10 + j;
+        delete x[1];
+        delete x[3][2];
+        return x;
+    }
+}
+// ====
+// compileViaYul: also
+// ----
+// del() -> 0, 1, 2, 0, 0, 0, 0x20, 0x21, 0x22, 0x30, 0x31, 0