Drop unnecessary usages of OptIn(ObsoleteDescriptorBasedAPI)

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/lazy/Fir2IrLazyProperty.kt

@@ -103,7 +103,6 @@ class Fir2IrLazyProperty(
         }
     }
 
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
     override var backingField: IrField? by lazyVar(lock) {
         // TODO: this checks are very preliminary, FIR resolve should determine backing field presence itself
         val parent = parent

compiler/ir/backend.jvm/codegen/src/org/jetbrains/kotlin/backend/jvm/codegen/IrSourceCompilerForInline.kt

@@ -17,7 +17,6 @@ import org.jetbrains.kotlin.incremental.components.Position
 import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.declarations.IrDeclaration
 import org.jetbrains.kotlin.ir.declarations.IrFunction
-import org.jetbrains.kotlin.ir.declarations.name
 import org.jetbrains.kotlin.ir.descriptors.toIrBasedDescriptor
 import org.jetbrains.kotlin.ir.expressions.IrFunctionAccessExpression
 import org.jetbrains.kotlin.ir.expressions.IrLoop

compiler/ir/backend.jvm/lower/src/org/jetbrains/kotlin/backend/jvm/lower/ReflectiveAccess.kt

@@ -12,7 +12,6 @@ import org.jetbrains.kotlin.backend.jvm.JvmBackendContext
 import org.jetbrains.kotlin.backend.jvm.defaultArgumentCleanerPhase
 import org.jetbrains.kotlin.backend.jvm.ir.*
 import org.jetbrains.kotlin.backend.jvm.lower.SyntheticAccessorLowering.Companion.isAccessible
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.*
 import org.jetbrains.kotlin.ir.declarations.*
@@ -82,7 +81,6 @@ internal class ReflectiveAccessLowering(
     // `fieldLocationAndReceiver`.
     val callsOnCompanionObjects: MutableMap<IrCall, IrClassSymbol> = mutableMapOf()
 
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
     private fun recordCompanionObjectAsDispatchReceiver(expression: IrCall) {
         val dispatchReceiver = expression.dispatchReceiver as? IrGetField ?: return
         val dispatchReceiverType = dispatchReceiver.symbol.owner.type as? IrSimpleType ?: return

compiler/ir/backend.jvm/src/org/jetbrains/kotlin/backend/jvm/ir/JvmIrUtils.kt

@@ -67,7 +67,6 @@ import org.jetbrains.kotlin.resolve.jvm.AsmTypes
 import org.jetbrains.kotlin.resolve.multiplatform.OptionalAnnotationUtil
 import org.jetbrains.kotlin.resolve.source.PsiSourceElement
 import org.jetbrains.kotlin.utils.DFS
-import org.jetbrains.kotlin.utils.addToStdlib.safeAs
 import java.io.File
 import org.jetbrains.org.objectweb.asm.Type
 import org.jetbrains.org.objectweb.asm.commons.Method

compiler/ir/ir.psi2ir/src/org/jetbrains/kotlin/psi2ir/descriptors/IrDescriptorBasedFunctionFactory.kt

@@ -458,21 +458,17 @@ private fun reflectFunctionClassFqn(shortName: Name): FqName = KOTLIN_REFLECT_FQ
 private fun reflectionFunctionClassName(isSuspend: Boolean, arity: Int): Name =
     Name.identifier("K${if (isSuspend) "Suspend" else ""}Function$arity")
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun KotlinBuiltIns.functionClassDescriptor(arity: Int): FunctionClassDescriptor =
     getFunction(arity) as FunctionClassDescriptor
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun KotlinBuiltIns.suspendFunctionClassDescriptor(arity: Int): FunctionClassDescriptor =
     getSuspendFunction(arity) as FunctionClassDescriptor
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun KotlinBuiltIns.kFunctionClassDescriptor(arity: Int): FunctionClassDescriptor {
     val kFunctionFqn = reflectFunctionClassFqn(reflectionFunctionClassName(false, arity))
     return getBuiltInClassByFqName(kFunctionFqn) as FunctionClassDescriptor
 }
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun KotlinBuiltIns.kSuspendFunctionClassDescriptor(arity: Int): FunctionClassDescriptor {
     val kFunctionFqn =
         reflectFunctionClassFqn(reflectionFunctionClassName(true, arity))

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrFunctionImpl.kt

@@ -134,7 +134,6 @@ class IrFakeOverrideFunctionImpl(
     override val descriptor
         get() = _symbol?.descriptor ?: this.toIrBasedDescriptor()
 
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
     override fun acquireSymbol(symbol: IrSimpleFunctionSymbol): IrSimpleFunction {
         assert(_symbol == null) { "$this already has symbol _symbol" }
         _symbol = symbol

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/declarations/impl/IrPropertyImpl.kt

@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.descriptors.toIrBasedDescriptor
 import org.jetbrains.kotlin.ir.expressions.IrConstructorCall
 import org.jetbrains.kotlin.ir.symbols.IrPropertySymbol
-import org.jetbrains.kotlin.ir.symbols.IrSimpleFunctionSymbol
 import org.jetbrains.kotlin.name.Name
 import org.jetbrains.kotlin.serialization.deserialization.descriptors.DeserializedContainerSource
 
@@ -108,7 +107,6 @@ class IrFakeOverridePropertyImpl(
     override val descriptor
         get() = _symbol?.descriptor ?: this.toIrBasedDescriptor()
 
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
     override fun acquireSymbol(symbol: IrPropertySymbol): IrProperty {
         assert(_symbol == null) { "$this already has symbol _symbol" }
         _symbol = symbol

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/symbols/impl/IrPublicSymbolBase.kt

@@ -13,7 +13,7 @@ import org.jetbrains.kotlin.ir.symbols.*
 import org.jetbrains.kotlin.ir.util.IdSignature
 import org.jetbrains.kotlin.ir.util.render
 
-abstract class IrPublicSymbolBase<out D : DeclarationDescriptor> @OptIn(ObsoleteDescriptorBasedAPI::class) constructor(
+abstract class IrPublicSymbolBase<out D : DeclarationDescriptor> constructor(
     override val signature: IdSignature,
     private val _descriptor: D?
 ) : IrSymbol {

compiler/ir/serialization.js/src/org/jetbrains/kotlin/ir/backend/js/klib.kt

@@ -37,7 +37,6 @@ import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.declarations.impl.IrFileImpl
 import org.jetbrains.kotlin.ir.descriptors.IrDescriptorBasedFunctionFactory
 import org.jetbrains.kotlin.ir.linkage.IrDeserializer
-import org.jetbrains.kotlin.ir.linkage.IrProvider
 import org.jetbrains.kotlin.ir.symbols.IrSymbol
 import org.jetbrains.kotlin.ir.util.*
 import org.jetbrains.kotlin.ir.visitors.acceptVoid
@@ -58,7 +57,6 @@ import org.jetbrains.kotlin.psi2ir.Psi2IrConfiguration
 import org.jetbrains.kotlin.psi2ir.Psi2IrTranslator
 import org.jetbrains.kotlin.psi2ir.descriptors.IrBuiltInsOverDescriptors
 import org.jetbrains.kotlin.psi2ir.generators.DeclarationStubGeneratorImpl
-import org.jetbrains.kotlin.psi2ir.generators.DeclarationStubGeneratorForNotFoundClasses
 import org.jetbrains.kotlin.psi2ir.generators.GeneratorContext
 import org.jetbrains.kotlin.psi2ir.generators.TypeTranslatorImpl
 import org.jetbrains.kotlin.resolve.BindingContext
@@ -68,7 +66,6 @@ import org.jetbrains.kotlin.storage.StorageManager
 import org.jetbrains.kotlin.util.DummyLogger
 import org.jetbrains.kotlin.util.Logger
 import org.jetbrains.kotlin.utils.DFS
-import org.jetbrains.kotlin.utils.addToStdlib.runIf
 import java.io.File
 
 val KotlinLibrary.moduleName: String
@@ -302,7 +299,6 @@ fun getFunctionFactoryCallback(stdlibModule: IrModuleFragment) = { packageFragme
     ).also { stdlibModule.files += it }
 }
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun loadIr(
     depsDescriptors: ModulesStructure,
     irFactory: IrFactory,