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/bytecodeListing/annotations/defaultTargets.txt

@@ -1,8 +1,6 @@
 @kotlin.jvm.internal.KotlinClass A {
-    public synthetic field $kotlinClass: kotlin.reflect.KClass
     private @AnnField @AnnParameterField @AnnTypeField field a: int
     private @AnnField @AnnTypeField field x: int
-    method <clinit>(): void
     private synthetic deprecated @AnnProperty @AnnFieldProperty @AnnParameterProperty method a$annotations(): void
     public method getA(): int
     private synthetic deprecated @AnnProperty @AnnFieldProperty method x$annotations(): void
@@ -20,4 +18,4 @@
 
 @kotlin.annotation.Target @java.lang.annotation.Retention @java.lang.annotation.Target @kotlin.jvm.internal.KotlinClass AnnProperty
 
-@kotlin.annotation.Target @java.lang.annotation.Retention @java.lang.annotation.Target @kotlin.jvm.internal.KotlinClass AnnTypeField
+@kotlin.annotation.Target @java.lang.annotation.Retention @java.lang.annotation.Target @kotlin.jvm.internal.KotlinClass AnnTypeField