[SMTChecker] Reset reference variables on assignment to a variable of reference type

test/libsolidity/smtCheckerTests/operators/assignment_contract_member_variable_array_3.sol

@@ -0,0 +1,21 @@
+pragma experimental SMTChecker;
+contract A {
+	int[] a;
+	function f() public {
+		require(a.length == 1 && a[0] == 1);
+		int[] storage u = a;
+		assert(u[0] == 1); // should hold
+		int[] memory b = new int[](2);
+		a = b;
+		assert(u[0] == 1); // should fail
+		A.a = b;
+		assert(u[0] == 1); // should fail
+	}
+
+	function push_v(int x) public {
+		a.push(x);
+	}
+}
+// ----
+// Warning 6328: (220-237): CHC: Assertion violation happens here.
+// Warning 6328: (267-284): CHC: Assertion violation happens here.

test/libsolidity/smtCheckerTests/types/bytes_2.sol

@@ -7,3 +7,5 @@ contract C
 		assert(b1[1] == b2[1]);
 	}
 }
+// ----
+// Warning 6328: (119-141): CHC: Assertion violation happens here.\nCounterexample:\n\n\nTransaction trace:\nC.constructor()\nC.f(b1, b2)