IR: remove unneeded ObsoleteDescriptorBasedAPI uses from backend.common

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/TailRecursionCallsCollector.kt

@@ -16,7 +16,6 @@
 
 package org.jetbrains.kotlin.backend.common
 
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.declarations.IrClass
 import org.jetbrains.kotlin.ir.declarations.IrFunction
@@ -35,7 +34,6 @@ import org.jetbrains.kotlin.ir.visitors.IrElementVisitor
  * It is also not guaranteed that each returned call is detected as tail recursion by the frontend.
  * However any returned call can be correctly optimized as tail recursion.
  */
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun collectTailRecursionCalls(irFunction: IrFunction): Set<IrCall> {
     if ((irFunction as? IrSimpleFunction)?.isTailrec != true) {
         return emptySet()

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrInlineUtils.kt

@@ -8,7 +8,6 @@ package org.jetbrains.kotlin.backend.common.ir
 import org.jetbrains.kotlin.backend.common.lower.VariableRemapper
 import org.jetbrains.kotlin.descriptors.FunctionDescriptor
 import org.jetbrains.kotlin.ir.IrStatement
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.declarations.*
 import org.jetbrains.kotlin.ir.descriptors.WrappedClassConstructorDescriptor
 import org.jetbrains.kotlin.ir.descriptors.WrappedSimpleFunctionDescriptor
@@ -83,7 +82,6 @@ private fun IrBody.move(
 
 // TODO use a generic inliner (e.g. JS/Native's FunctionInlining.Inliner)
 // Inline simple function calls without type parameters, default parameters, or varargs.
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun IrFunction.inline(target: IrDeclarationParent, arguments: List<IrValueDeclaration> = listOf()): IrReturnableBlock =
     IrReturnableBlockImpl(startOffset, endOffset, returnType, IrReturnableBlockSymbolImpl(getNewWrappedDescriptor()), null, symbol).apply {
         statements += body!!.move(this@inline, target, symbol, valueParameters.zip(arguments).toMap()).statements

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/IrUtils.kt

@@ -164,7 +164,6 @@ fun IrTypeParameter.copyToWithoutSuperTypes(
     this.index = index
 }
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 fun IrFunction.copyReceiverParametersFrom(from: IrFunction) {
     dispatchReceiverParameter = from.dispatchReceiverParameter?.run {
         val newDescriptor = WrappedReceiverParameterDescriptor()

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/DefaultArgumentStubGenerator.kt

@@ -11,7 +11,6 @@ import org.jetbrains.kotlin.backend.common.ir.*
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 import org.jetbrains.kotlin.descriptors.DescriptorVisibility
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.*
 import org.jetbrains.kotlin.ir.builders.declarations.addValueParameter
@@ -539,7 +538,6 @@ private fun IrFunction.generateDefaultsFunction(
     return null
 }
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 private fun IrFunction.generateDefaultsFunctionImpl(
         context: CommonBackendContext,
         newOrigin: IrDeclarationOrigin,

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/LocalDeclarationsLowering.kt

@@ -11,7 +11,6 @@ import org.jetbrains.kotlin.backend.common.descriptors.synthesizedString
 import org.jetbrains.kotlin.backend.common.ir.*
 import org.jetbrains.kotlin.backend.common.runOnFilePostfix
 import org.jetbrains.kotlin.descriptors.Modality
-import org.jetbrains.kotlin.descriptors.ReceiverParameterDescriptor
 import org.jetbrains.kotlin.descriptors.DescriptorVisibilities
 import org.jetbrains.kotlin.descriptors.DescriptorVisibility
 import org.jetbrains.kotlin.ir.*
@@ -200,7 +199,6 @@ class LocalDeclarationsLowering(
         body.remapTypes(typeRemapper)
     }
 
-    @OptIn(ObsoleteDescriptorBasedAPI::class)
     private inner class LocalDeclarationsTransformer(
         val irElement: IrElement, val container: IrDeclaration, val classesToLower: Set<IrClass>?
     ) {

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/inline/FunctionInlining.kt

@@ -17,7 +17,6 @@ import org.jetbrains.kotlin.config.coroutinesIntrinsicsPackageFqName
 import org.jetbrains.kotlin.config.languageVersionSettings
 import org.jetbrains.kotlin.ir.IrElement
 import org.jetbrains.kotlin.ir.IrStatement
-import org.jetbrains.kotlin.ir.ObsoleteDescriptorBasedAPI
 import org.jetbrains.kotlin.ir.UNDEFINED_OFFSET
 import org.jetbrains.kotlin.ir.builders.irReturn
 import org.jetbrains.kotlin.ir.declarations.*
@@ -77,7 +76,6 @@ open class DefaultInlineFunctionResolver(open val context: CommonBackendContext)
     }
 }
 
-@OptIn(ObsoleteDescriptorBasedAPI::class)
 class FunctionInlining(
     val context: CommonBackendContext,
     val inlineFunctionResolver: InlineFunctionResolver