[SMTChecker] Support bound function calls

test/libsolidity/smtCheckerTests/functions/functions_bound_1.sol

@@ -0,0 +1,19 @@
+pragma experimental SMTChecker;
+
+library L
+{
+	function add(uint x, uint y) internal pure returns (uint) {
+		require(x < 1000);
+		require(y < 1000);
+		return x + y;
+	}
+}
+
+contract C
+{
+	using L for uint;
+	function f(uint x) public pure {
+		uint y = x.add(999);
+		assert(y < 10000);
+	}
+}

test/libsolidity/smtCheckerTests/functions/functions_bound_1_fail.sol

@@ -0,0 +1,21 @@
+pragma experimental SMTChecker;
+
+library L
+{
+	function add(uint x, uint y) internal pure returns (uint) {
+		require(x < 1000);
+		require(y < 1000);
+		return x + y;
+	}
+}
+
+contract C
+{
+	using L for uint;
+	function f(uint x) public pure {
+		uint y = x.add(999);
+		assert(y < 1000);
+	}
+}
+// ----
+// Warning: (261-277): Assertion violation happens here

test/libsolidity/smtCheckerTests/functions/functions_library_1.sol

@@ -0,0 +1,18 @@
+pragma experimental SMTChecker;
+
+library L
+{
+	function add(uint x, uint y) internal pure returns (uint) {
+		require(x < 1000);
+		require(y < 1000);
+		return x + y;
+	}
+}
+
+contract C
+{
+	function f(uint x) public pure {
+		uint y = L.add(x, 999);
+		assert(y < 10000);
+	}
+}

test/libsolidity/smtCheckerTests/functions/functions_library_1_fail.sol

@@ -0,0 +1,20 @@
+pragma experimental SMTChecker;
+
+library L
+{
+	function add(uint x, uint y) internal pure returns (uint) {
+		require(x < 1000);
+		require(y < 1000);
+		return x + y;
+	}
+}
+
+contract C
+{
+	function f(uint x) public pure {
+		uint y = L.add(x, 999);
+		assert(y < 1000);
+	}
+}
+// ----
+// Warning: (245-261): Assertion violation happens here