Revert "enhance tests (mostly codegen)" temporarily

This reverts commit 95f9bcbacb.

compiler/tests/org/jetbrains/jet/codegen/TupleGenTest.java

@@ -16,11 +16,8 @@
 
 package org.jetbrains.jet.codegen;
 
-import org.jetbrains.jet.lang.resolve.java.CompilerSpecialMode;
-
 public class TupleGenTest extends CodegenTestCase {
     public void testBasic() {
-        createEnvironmentWithMockJdk(CompilerSpecialMode.JDK_HEADERS);
         blackBoxFile("/tuples/basic.jet");
 //        System.out.println(generateToText());
     }