Sort tests.

test/libsolidity/semanticTests/libraries/internal_library_function_calling_private.sol

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+// tests that internal library functions that are called from outside and that
+// themselves call private functions are still able to (i.e. the private function
+// also has to be pulled into the caller's code)
+// This has to work without linking, because everything will be inlined.
+library L {
+    function g(uint256[] memory _data) private {
+        _data[3] = 2;
+    }
+
+    function f(uint256[] memory _data) internal {
+        g(_data);
+    }
+}
+
+
+contract C {
+    function f() public returns (uint256) {
+        uint256[] memory x = new uint256[](7);
+        x[3] = 8;
+        L.f(x);
+        return x[3];
+    }
+}
+
+// ----
+// f() -> 2