[SMTChecker] Add test that shows that deleting arrays takes the index into account

test/libsolidity/smtCheckerTests/operators/delete_multid_array.sol

@@ -0,0 +1,42 @@
+pragma experimental SMTChecker;
+
+contract C {
+	uint[] a;
+	uint[][] b;
+	function f(uint x, uint y, uint v) public {
+		a[x] = v;
+		delete a;
+		assert(a[y] == 0);
+	}
+ 	function g(uint x, uint y, uint v) public {
+		b[x][y] = v;
+		delete b;
+		assert(b[y][x] == 0);
+	}
+ 	function h(uint x, uint y, uint v) public {
+		b[x][y] = v;
+		delete b[x];
+		// Not necessarily the case.
+		assert(b[y][x] == 0);
+	}
+ 	function i(uint x, uint y, uint v) public {
+		b[x][y] = v;
+		delete b[y];
+		assert(b[y][x] == 0);
+	}
+ 	function j(uint x, uint y, uint z, uint v) public {
+		b[x][y] = v;
+		delete b[z];
+		// Not necessarily the case.
+		assert(b[y][x] == 0);
+	}
+	function setA(uint x, uint y) public {
+		a[x] = y;
+	}
+	function setB(uint x, uint y, uint z) public {
+		b[x][y] = z;
+	}
+}
+// ----
+// Warning: (372-392): Assertion violation happens here
+// Warning: (617-637): Assertion violation happens here