[SMTChecker] Added support for public getters through this.

test/libsolidity/smtCheckerTests/functions/getters/fixed_bytes.sol

@@ -0,0 +1,18 @@
+pragma experimental SMTChecker;
+
+contract C {
+	byte public x;
+	bytes3 public y;
+
+	function f() public view {
+		byte a = this.x();
+		bytes3 b = this.y();
+		assert(a == x); // should hold
+		assert(a == 'a'); // should fail
+		assert(b == y); // should hold
+		assert(y == "abc"); // should fail
+	}
+}
+// ----
+// Warning 6328: (188-204): CHC: Assertion violation happens here.
+// Warning 6328: (256-274): CHC: Assertion violation happens here.