Sort tests.

test/libsolidity/semanticTests/abiEncoderV2/abi_encode_empty_string_v2.sol

@@ -0,0 +1,13 @@
+// Tests that this will not end up using a "bytes0" type
+// (which would assert)
+pragma experimental ABIEncoderV2;
+
+
+contract C {
+    function f() public pure returns (bytes memory, bytes memory) {
+        return (abi.encode(""), abi.encodePacked(""));
+    }
+}
+
+// ----
+// f() -> 0x40, 0xa0, 0x40, 0x20, 0x0, 0x0