Add tx constraints to CHC

test/libsolidity/smtCheckerTests/functions/internal_call_inheritance_2.sol

@@ -1,24 +0,0 @@
-pragma experimental SMTChecker;
-
-contract C {
-	uint y;
-	function c(uint _y) public returns (uint) {
-		y = _y;
-		return y;
-	}
-}
-
-contract B is C {
-	function b() public returns (uint) { return c(42); }
-}
-
-contract A is B {
-	uint public x;
-
-	function a() public {
-		x = b();
-		assert(x < 40);
-	}
-}
-// ----
-// Warning 6328: (274-288): CHC: Assertion violation happens here.