Sort tests.

test/libsolidity/semanticTests/abiEncoderV1/abi_encode.sol

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+contract C {
+    function f0() public returns (bytes memory) {
+        return abi.encode();
+    }
+
+    function f1() public returns (bytes memory) {
+        return abi.encode(1, 2);
+    }
+
+    function f2() public returns (bytes memory) {
+        string memory x = "abc";
+        return abi.encode(1, x, 2);
+    }
+
+    function f3() public returns (bytes memory r) {
+        // test that memory is properly allocated
+        string memory x = "abc";
+        r = abi.encode(1, x, 2);
+        bytes memory y = "def";
+        require(y[0] == "d");
+        y[0] = "e";
+        require(y[0] == "e");
+    }
+
+    function f4() public returns (bytes memory) {
+        bytes4 x = "abcd";
+        return abi.encode(bytes2(x));
+    }
+}
+
+// ----
+// f0() -> 0x20, 0x0
+// f1() -> 0x20, 0x40, 0x1, 0x2
+// f2() -> 0x20, 0xa0, 0x1, 0x60, 0x2, 0x3, "abc"
+// f3() -> 0x20, 0xa0, 0x1, 0x60, 0x2, 0x3, "abc"
+// f4() -> 0x20, 0x20, "ab"