[native] remove obsolete experimental stdlib api usage annotations

^KT-62510

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/llvm/HashUtils.kt

@@ -7,7 +7,6 @@ package org.jetbrains.kotlin.backend.konan.llvm
 
 import org.jetbrains.kotlin.backend.common.serialization.cityHash64
 
-@OptIn(ExperimentalUnsignedTypes::class)
 internal fun localHash(data: ByteArray): Long {
     return cityHash64(data).toLong()
 }

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/lower/DelegationLowering.kt

@@ -243,7 +243,7 @@ internal class PropertyDelegationLowering(val generationState: NativeGenerationS
                     generatedClasses.add(newClass)
                     return newExpression as IrConstantValue
                 }
-                return irConstantObject(clazz, @OptIn(ExperimentalStdlibApi::class) buildMap {
+                return irConstantObject(clazz, buildMap {
                     put("name", irConstantPrimitive(name))
                     put("getter", getterCallableReference.convert())
                     if (setterCallableReference != null) {

kotlin-native/backend.native/compiler/ir/backend.native/src/org/jetbrains/kotlin/backend/konan/optimizations/DevirtualizationAnalysis.kt

@@ -878,7 +878,6 @@ internal object DevirtualizationAnalysis {
             val directEdgesCount = IntArrayList()
             val reversedEdgesCount = IntArrayList()
 
-            @OptIn(ExperimentalUnsignedTypes::class)
             private fun addEdge(from: Node, to: Node) {
                 val fromId = from.id
                 val toId = to.id
@@ -1263,7 +1262,7 @@ internal object DevirtualizationAnalysis {
                             node.constructor?.let {
                                 doCall(
                                         it,
-                                        @OptIn(ExperimentalStdlibApi::class) buildList {
+                                        buildList {
                                             add(instanceNode)
                                             node.arguments?.forEach { add(edgeToConstraintNode(it)) }
                                         },