[analysis] remove redundant OptIn annotations

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/api/KtDeclarationAndFirDeclarationEqualityChecker.kt

@@ -97,7 +97,6 @@ object KtDeclarationAndFirDeclarationEqualityChecker {
         return true
     }
 
-    @OptIn(ExperimentalStdlibApi::class)
     private fun FirTypeRef.renderTypeAsKotlinType(isVararg: Boolean = false): String {
         val rendered = when (this) {
             is FirResolvedTypeRef -> type.renderTypeAsKotlinType()
@@ -147,7 +146,6 @@ object KtDeclarationAndFirDeclarationEqualityChecker {
         return "kotlin.Array<out $this>"
     }
 
-    @OptIn(ExperimentalStdlibApi::class)
     private val classIdToName: Map<String, String> = buildList<Pair<String, String>> {
         StandardClassIds.primitiveArrayTypeByElementType.mapTo(this) { (classId, arrayClassId) ->
             classId.asString().replace('/', '.') to arrayClassId.asString().replace('/', '.')

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/file/structure/FileStructure.kt

@@ -57,7 +57,6 @@ internal class FileStructure private constructor(
             ?: error("FileStructureElement for was not defined for \n${declaration.getElementTextInContext()}")
     }
 
-    @OptIn(ExperimentalStdlibApi::class)
     fun getAllDiagnosticsForFile(diagnosticCheckerFilter: DiagnosticCheckerFilter): Collection<KtPsiDiagnostic> {
         val structureElements = getAllStructureElements()
 

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/file/structure/FirElementsRecorder.kt

@@ -189,7 +189,6 @@ internal open class FirElementsRecorder : FirVisitor<Unit, MutableMap<KtElement,
     }
 
     companion object {
-        @OptIn(ExperimentalStdlibApi::class)
         fun recordElementsFrom(firElement: FirElement, recorder: FirElementsRecorder): Map<KtElement, FirElement> =
             buildMap { firElement.accept(recorder, this) }
     }

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/providers/LLFirBuiltinSymbolProvider.kt

@@ -24,7 +24,6 @@ class LLFirBuiltinSymbolProvider(
     moduleData: FirModuleData,
     kotlinScopeProvider: FirKotlinScopeProvider
 ) : FirBuiltinSymbolProvider(session, moduleData, kotlinScopeProvider) {
-    @OptIn(ExperimentalStdlibApi::class)
     private val functionsCache = session.firCachesFactory.createCache { callableId: CallableId ->
         buildList {
             getTopLevelFunctionSymbolsToByPackageFragments(this, callableId.packageName, callableId.callableName)

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/sessions/LLFirBuiltinsAndCloneableSession.kt

@@ -10,7 +10,6 @@ import org.jetbrains.kotlin.analysis.project.structure.KtModule
 import org.jetbrains.kotlin.fir.BuiltinTypes
 import org.jetbrains.kotlin.fir.PrivateSessionConstructor
 
-@OptIn(PrivateSessionConstructor::class)
 class LLFirBuiltinsAndCloneableSession @PrivateSessionConstructor constructor(
     override val ktModule: KtModule,
     project: Project,

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/sessions/LLFirLibrariesSession.kt

@@ -13,7 +13,6 @@ import org.jetbrains.kotlin.fir.PrivateSessionConstructor
 /**
  * [org.jetbrains.kotlin.fir.FirSession] responsible for all libraries analysing module transitively depends on
  */
-@OptIn(PrivateSessionConstructor::class)
 internal class LLFirLibrarySession @PrivateSessionConstructor constructor(
     override val ktModule: KtModule,
     project: Project,

analysis/low-level-api-fir/src/org/jetbrains/kotlin/analysis/low/level/api/fir/sessions/LLFirSessionProviderStorage.kt

@@ -114,7 +114,6 @@ private class LLFirSessionsCache {
         return newMappings to result
     }
 
-    @OptIn(ExperimentalStdlibApi::class)
     private fun getSessions(): Map<KtModule, LLFirSession> = buildMap {
         val sessions = mappings.values
         val wasSessionInvalidated = sessions.associateWithTo(hashMapOf()) { false }

analysis/low-level-api-fir/tests/org/jetbrains/kotlin/analysis/low/level/api/fir/file/structure/AbstractFileStructureTest.kt

@@ -92,7 +92,6 @@ abstract class AbstractFileStructureTest : AbstractLowLevelApiSingleFileTest() {
         return session.moduleComponents.fileStructureCache.getFileStructure(this)
     }
 
-    @OptIn(ExperimentalStdlibApi::class)
     private fun FileStructure.getAllStructureElements(ktFile: KtFile): Collection<FileStructureElement> = buildSet {
         ktFile.forEachDescendantOfType<KtElement> { ktElement ->
             add(getStructureElementFor(ktElement))