[SMTChecker] Support events and low-level logs

test/libsolidity/smtCheckerTests/special/event.sol

@@ -0,0 +1,28 @@
+pragma experimental SMTChecker;
+
+contract C {
+	event Nudge();
+	event SomeArgs(uint, uint);
+	event Caller(address, uint);
+	function f() payable external {
+		emit Nudge();
+		emit SomeArgs(134, 567);
+		emit Caller(msg.sender, msg.value);
+	}
+	function g_data() pure internal returns (uint) {
+		assert(true);
+	}
+	function g() external {
+		emit SomeArgs(g_data(), g_data());
+	}
+	bool x = true;
+	function h_data() view internal returns (uint) {
+		assert(x);
+	}
+	function h() external {
+		x = false;
+		emit SomeArgs(h_data(), h_data());
+	}
+}
+// ----
+// Warning 6328: (440-449): Assertion violation happens here.

test/libsolidity/smtCheckerTests/special/log.sol

@@ -0,0 +1,39 @@
+pragma experimental SMTChecker;
+
+contract C {
+	function f() external {
+		bytes32 t1 = bytes32(uint256(0x1234));
+		log0(t1);
+		log1(t1, t1);
+		log2(t1, t1, t1);
+		log3(t1, t1, t1, t1);
+		log4(t1, t1, t1, t1, t1);
+	}
+	function g_data() pure internal returns (bytes32) {
+		assert(true);
+		return bytes32(uint256(0x5678));
+	}
+	function g() external {
+		// To test that the function call is actually visited.
+		log0(g_data());
+		log1(g_data(), g_data());
+		log2(g_data(), g_data(), g_data());
+		log3(g_data(), g_data(), g_data(), g_data());
+		log4(g_data(), g_data(), g_data(), g_data(), g_data());
+	}
+	bool x = true;
+	function h_data() view internal returns (bytes32) {
+		assert(x);
+	}
+	function h() external {
+		// To test that the function call is actually visited.
+		x = false;
+		log0(h_data());
+		log1(h_data(), h_data());
+		log2(h_data(), h_data(), h_data());
+		log3(h_data(), h_data(), h_data(), h_data());
+		log4(h_data(), h_data(), h_data(), h_data(), h_data());
+	}
+}
+// ----
+// Warning 6328: (668-677): Assertion violation happens here.