Revert "[Wasm] Support lazy associated object initialisation"

This reverts commit 552ee1ee38.

libraries/stdlib/wasm/src/kotlin/reflect/associatedObjectsImpl.kt

@@ -8,16 +8,35 @@ package kotlin.wasm.internal
 import kotlin.reflect.wasm.internal.KClassImpl
 import kotlin.reflect.KClass
 
+internal var associatedObjects: Map<ULong, Any>? = null
+
 @PublishedApi
 internal fun findAssociatedObject(klass: KClass<*>, key: Int): Any? {
     val klassId = (klass as? KClassImpl<*>)?.typeData?.typeId ?: return null
-    return tryGetAssociatedObject(klassId, key)
+
+    val map = associatedObjects ?: run {
+        val newMap: MutableMap<ULong, Any> = mutableMapOf()
+        initAssociatedObjects(newMap)
+        associatedObjects = newMap
+        newMap
+    }
+
+    return map[packIntoULong(klassId, key)]
 }
 
-internal fun tryGetAssociatedObject(
-    @Suppress("UNUSED_PARAMETER") klassId: Int,
-    @Suppress("UNUSED_PARAMETER") keyId: Int,
-): Any? {
+internal fun packIntoULong(a: Int, b: Int): ULong =
+    (a.toUInt().toULong() shl Int.SIZE_BITS) or b.toUInt().toULong()
+
+internal fun addAssociatedObject(
+    mapToInit: MutableMap<ULong, Any>,
+    klassId: Int,
+    keyId: Int,
+    instance: Any
+) {
+    mapToInit[packIntoULong(klassId, keyId)] = instance
+}
+
+internal fun initAssociatedObjects(@Suppress("UNUSED_PARAMETER") mapToInit: MutableMap<ULong, Any>) {
     // Init implicitly with AssociatedObjectsLowering
-    return null
+    // addAssociatedObject(mapToInit, ...)
 }