[FIR2IR] add option to allow IdSignature for members of local classes

^KT-54311

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrSignatureComposer.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Copyright 2010-2022 JetBrains s.r.o. and Kotlin Programming Language contributors.
  * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
  */
 
@@ -17,7 +17,8 @@ interface Fir2IrSignatureComposer {
     fun composeSignature(
         declaration: FirDeclaration,
         containingClass: ConeClassLikeLookupTag? = null,
-        forceTopLevelPrivate: Boolean = false
+        forceTopLevelPrivate: Boolean = false,
+        allowLocalClasses: Boolean = false,
     ): IdSignature?
 
     fun composeAccessorSignature(

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/signaturer/FirBasedSignatureComposer.kt

@@ -84,23 +84,27 @@ class FirBasedSignatureComposer(override val mangler: FirMangler) : Fir2IrSignat
     override fun composeSignature(
         declaration: FirDeclaration,
         containingClass: ConeClassLikeLookupTag?,
-        forceTopLevelPrivate: Boolean
+        forceTopLevelPrivate: Boolean,
+        allowLocalClasses: Boolean,
     ): IdSignature? {
         if (declaration is FirAnonymousObject || declaration is FirAnonymousFunction) return null
         if (declaration is FirRegularClass && declaration.classId.isLocal) return null
         if (declaration is FirCallableDeclaration) {
             if (declaration.visibility == Visibilities.Local) return null
-            if (declaration.dispatchReceiverClassOrNull()?.classId?.isLocal == true || containingClass?.classId?.isLocal == true) return null
+            if (!allowLocalClasses && (declaration.dispatchReceiverClassOrNull()?.classId?.isLocal == true || containingClass?.classId?.isLocal == true)) return null
         }
+
         val declarationWithParentId = FirDeclarationWithParentId(declaration, containingClass?.classId)
         val publicSignature = signatureCache.getOrPut(declarationWithParentId) {
             calculatePublicSignature(declarationWithParentId)
         }
+
         val resultSignature: IdSignature = if (isTopLevelPrivate(declaration) || forceTopLevelPrivate) {
             val fileSig = fileSignature ?: declaration.fakeFileSignature(publicSignature)
             IdSignature.CompositeSignature(fileSig, publicSignature)
         } else
             publicSignature
+
         return resultSignature
     }