[SMTChecker] Support to bitwise

test/libsolidity/smtCheckerTests/operators/bitwise_and_int.sol

@@ -0,0 +1,18 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		int8 x = 1;
+		int8 y = 0;
+		assert(x & y != 0);
+		x = -1; y = 3;
+		assert(x & y == 3);
+		y = -1;
+		int8 z = x & y;
+		assert(z == -1);
+		y = 127;
+		assert(x & y == 127);
+	}
+}
+// ----
+// Warning: (104-122): Assertion violation happens here

test/libsolidity/smtCheckerTests/operators/bitwise_and_rational.sol

@@ -0,0 +1,12 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		assert(1 & 0 != 0);
+		assert(-1 & 3 == 3);
+		assert(-1 & -1 == -1);
+		assert(-1 & 127 == 127);
+	}
+}
+// ----
+// Warning: (76-94): Assertion violation happens here

test/libsolidity/smtCheckerTests/operators/bitwise_and_uint.sol

@@ -0,0 +1,18 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() public pure {
+		uint8 x = 1;
+		uint16 y = 0;
+		assert(x & y != 0);
+		x = 0xff;
+		y = 0xffff;
+		assert(x & y == 0xff);
+		assert(x & y == 0xffff);
+		assert(x & y == 0x0000);
+	}
+}
+// ----
+// Warning: (107-125): Assertion violation happens here
+// Warning: (180-203): Assertion violation happens here
+// Warning: (207-230): Assertion violation happens here