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/onProperties.txt

@@ -1,9 +1,7 @@
 @kotlin.jvm.internal.KotlinClass A {
-    public synthetic field $kotlinClass: kotlin.reflect.KClass
     private @AnnField field p: int
     private @AnnField field x: int
     private field y: int
-    method <clinit>(): void
     private synthetic deprecated @AnnProp @AnnProp2 method p$annotations(): void
     public @AnnGetter method getP(): int
     public @AnnSetter method setP(@AnnParam p0: int): void
@@ -24,4 +22,4 @@
 
 @java.lang.annotation.Retention @kotlin.jvm.internal.KotlinClass AnnProp2
 
-@java.lang.annotation.Retention @kotlin.jvm.internal.KotlinClass AnnSetter
+@java.lang.annotation.Retention @kotlin.jvm.internal.KotlinClass AnnSetter