initial support for generating extension functions

idea/tests/org/jetbrains/jet/codegen/ExtensionFunctionsTest.java

@@ -0,0 +1,20 @@
+package org.jetbrains.jet.codegen;
+
+import java.lang.reflect.Method;
+
+/**
+ * @author yole
+ */
+public class ExtensionFunctionsTest extends CodegenTestCase {
+    @Override
+    protected String getPrefix() {
+        return "extensionFunctions";
+    }
+
+    public void testSimple() throws Exception {
+        loadFile();
+        final Method foo = generateFunction("foo");
+        final Character c = (Character) foo.invoke(null);
+        assertEquals('f', c.charValue());
+    }
+}