Sort tests.

test/libsolidity/semanticTests/functionCall/send_zero_ether.sol

@@ -0,0 +1,19 @@
+// Sending zero ether to a contract should still invoke the receive ether function
+// (it previously did not because the gas stipend was not provided by the EVM)
+contract Receiver {
+    receive() external payable {}
+}
+
+
+contract Main {
+    constructor() public payable {}
+
+    function s() public returns (bool) {
+        Receiver r = new Receiver();
+        return address(r).send(0);
+    }
+}
+
+// ----
+// constructor(), 20 wei ->
+// s() -> true