[IR.serialization.jvm] Use Descriptor-based IR in JvmIrLinker only

compiler/ir/serialization.jvm/build.gradle.kts

@@ -17,12 +17,4 @@ sourceSets {
         projectDefault()
     }
     "test" {}
-}
-
-tasks {
-    val compileKotlin by existing(org.jetbrains.kotlin.gradle.tasks.KotlinCompile::class) {
-        kotlinOptions {
-            freeCompilerArgs += "-Xopt-in=org.jetbrains.kotlin.ir.DescriptorBasedIr"
-        }
-    }
 }

compiler/ir/serialization.jvm/src/org/jetbrains/kotlin/ir/backend/jvm/serialization/JvmIrLinker.kt

@@ -12,6 +12,7 @@ import org.jetbrains.kotlin.backend.common.serialization.encodings.BinarySymbolD
 import org.jetbrains.kotlin.backend.common.serialization.signature.IdSignatureSerializer
 import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.descriptors.konan.KlibModuleOrigin
+import org.jetbrains.kotlin.ir.DescriptorBasedIr
 import org.jetbrains.kotlin.ir.declarations.IrField
 import org.jetbrains.kotlin.ir.declarations.IrModuleFragment
 import org.jetbrains.kotlin.ir.declarations.impl.IrModuleFragmentImpl
@@ -28,8 +29,16 @@ import org.jetbrains.kotlin.load.java.descriptors.JavaClassDescriptor
 import org.jetbrains.kotlin.load.java.lazy.descriptors.LazyJavaPackageFragment
 import org.jetbrains.kotlin.name.Name
 
-class JvmIrLinker(currentModule: ModuleDescriptor?, logger: LoggingContext, builtIns: IrBuiltIns, symbolTable: SymbolTable, override val functionalInteraceFactory: IrAbstractFunctionFactory, private val stubGenerator: DeclarationStubGenerator, private val manglerDesc: JvmManglerDesc) :
-    KotlinIrLinker(currentModule, logger, builtIns, symbolTable, emptyList()) {
+@OptIn(DescriptorBasedIr::class)
+class JvmIrLinker(
+    currentModule: ModuleDescriptor?,
+    logger: LoggingContext,
+    builtIns: IrBuiltIns,
+    symbolTable: SymbolTable,
+    override val functionalInteraceFactory: IrAbstractFunctionFactory,
+    private val stubGenerator: DeclarationStubGenerator,
+    private val manglerDesc: JvmManglerDesc
+) : KotlinIrLinker(currentModule, logger, builtIns, symbolTable, emptyList()) {
 
     override val fakeOverrideBuilderImpl = FakeOverrideBuilderImpl(symbolTable, IdSignatureSerializer(JvmManglerIr), builtIns)