Minor: make variables initialized in defineClass lateinit instead of nullable.

compiler/frontend.java/src/org/jetbrains/kotlin/resolve/jvm/diagnostics/ConflictingJvmDeclarationsData.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2015 JetBrains s.r.o.
+ * Copyright 2010-2016 JetBrains s.r.o.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -17,7 +17,7 @@
 package org.jetbrains.kotlin.resolve.jvm.diagnostics
 
 class ConflictingJvmDeclarationsData(
-        val classInternalName: String?,
+        val classInternalName: String,
         val classOrigin: JvmDeclarationOrigin,
         val signature: RawSignature,
         val signatureOrigins: Collection<JvmDeclarationOrigin>