FIR Java: make method annotations lazy

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/builder/FirSimpleFunctionBuilder.kt

@@ -6,7 +6,6 @@
 package org.jetbrains.kotlin.fir.declarations.builder
 
 import kotlin.contracts.*
-import org.jetbrains.kotlin.fir.FirImplementationDetail
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.FirSourceElement
 import org.jetbrains.kotlin.fir.builder.FirAnnotationContainerBuilder
@@ -58,7 +57,6 @@ open class FirSimpleFunctionBuilder : FirFunctionBuilder, FirTypeParametersOwner
     override val annotations: MutableList<FirAnnotationCall> = mutableListOf()
     override val typeParameters: MutableList<FirTypeParameter> = mutableListOf()
 
-    @OptIn(FirImplementationDetail::class)
     override fun build(): FirSimpleFunction {
         return FirSimpleFunctionImpl(
             source,

compiler/fir/tree/gen/org/jetbrains/kotlin/fir/declarations/impl/FirSimpleFunctionImpl.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.fir.declarations.impl
 
-import org.jetbrains.kotlin.fir.FirImplementationDetail
 import org.jetbrains.kotlin.fir.FirSession
 import org.jetbrains.kotlin.fir.FirSourceElement
 import org.jetbrains.kotlin.fir.contracts.FirContractDescription
@@ -31,7 +30,7 @@ import org.jetbrains.kotlin.fir.visitors.*
  * DO NOT MODIFY IT MANUALLY
  */
 
-open class FirSimpleFunctionImpl @FirImplementationDetail constructor(
+internal class FirSimpleFunctionImpl(
     override val source: FirSourceElement?,
     override val session: FirSession,
     override var resolvePhase: FirResolvePhase,

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/ImplementationConfigurator.kt

@@ -449,9 +449,7 @@ object ImplementationConfigurator : AbstractFirTreeImplementationConfigurator()
             default("name", "Name.identifier(\"value\")")
         }
 
-        impl(simpleFunction) {
-            kind = OpenClass
-        }
+        impl(simpleFunction)
 
         impl(safeCallExpression) {
             useTypes(safeCallCheckedSubjectType)