Fix static virtual resolution

test/libsolidity/smtCheckerTests/inheritance/overriden_function_static_call_parent.sol

@@ -0,0 +1,21 @@
+pragma experimental SMTChecker;
+contract BaseBase {
+	uint x;
+	function init(uint a, uint b) public virtual {
+		x = a;
+	}
+}
+contract Base is BaseBase {
+	function init(uint a, uint b) public override {
+	}
+}
+contract Child is Base {
+	function bInit(uint c, uint d) public {
+		BaseBase.init(c, d);
+		assert(x == c);
+		assert(x == d); // should fail
+	}
+}
+// ----
+// Warning 5667: (84-90): Unused function parameter. Remove or comment out the variable name to silence this warning.
+// Warning 6328: (314-328): CHC: Assertion violation happens here.\nCounterexample:\nx = 0\nc = 0\nd = 1\n\nTransaction trace:\nChild.constructor()\nState: x = 0\nChild.bInit(0, 1)\n    BaseBase.init(0, 1) -- internal call