Added Module.to_native_object() and Module.to_native_assembly().

Added test for these new functions.

test/native.py

@@ -0,0 +1,53 @@
+#!/usr/bin/env python
+
+from llvm import *
+from llvm.core import *
+
+import unittest, subprocess
+
+class TestNative(unittest.TestCase):
+
+    def _make_module(self):
+        m = Module.new('module1')
+        m.add_global_variable(Type.int(), 'i')
+
+        fty = Type.function(Type.int(), [])
+        f = m.add_function(fty, name='main')
+
+        bldr = Builder.new(f.append_basic_block('entry'))
+        bldr.ret(Constant.int(Type.int(), 0xab))
+
+        return m
+
+    def _compile(self, src):
+        dst = '/tmp/llvmobj.out'
+        s = subprocess.call(['cc', '-o', dst, src])
+        if s != 0:
+            raise Exception("Cannot compile")
+
+        s = subprocess.call([dst])
+        self.assertEqual(s, 0xab)
+
+
+    def test_assembly(self):
+        m = self._make_module()
+        output = m.to_native_assembly()
+
+        src = '/tmp/llvmasm.s'
+        with open(src, 'wb') as fout:
+            fout.write(output)
+
+        self._compile(src)
+
+    def test_object(self):
+        m = self._make_module()
+        output = m.to_native_object()
+
+        src = '/tmp/llvmobj.o'
+        with open(src, 'wb') as fout:
+            fout.write(output)
+
+        self._compile(src)
+
+if __name__ == '__main__':
+    unittest.main()