Don't create KClass and KPackage instances in <clinit>

This proved to be a fragile technique, which probably doesn't even improve
performance in most cases but has lots of unexpected problems: unconditional
initialization of reflection classes, increasing the size of the bytecode, bugs
with <clinit> in annotations on JVM 6, inability to support conversion of a
class from Kotlin to Java without recompiling clients which use it
reflectively, etc.

compiler/testData/codegen/bytecodeText/deadCodeElimination/lastReturn.kt

@@ -17,7 +17,6 @@ fun box(): String {
 /*
     3 return's are defined in functions
     2 are from package facade
-    1 is from package clinit
 */
 
-// 6 RETURN
+// 5 RETURN