FIR2IR: use IR_EXTERNAL_DECLARATION_STUB for external classes

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrDeclarationStorage.kt

@@ -196,7 +196,7 @@ class Fir2IrDeclarationStorage(
                         getIrProperty(declaration, irClass)
                     }
                     is FirConstructor -> getIrConstructor(declaration, irClass)
-                    is FirRegularClass -> getIrClass(declaration)
+                    is FirRegularClass -> getIrClass(declaration, exactlySourceClass = false)
                     else -> continue
                 }
             }
@@ -250,7 +250,7 @@ class Fir2IrDeclarationStorage(
         }
     }
 
-    private fun createIrClass(klass: FirClass<*>): IrClass {
+    private fun createIrClass(klass: FirClass<*>, exactlySourceClass: Boolean = false): IrClass {
         // NB: klass can be either FirRegularClass or FirAnonymousObject
         if (klass is FirAnonymousObject) {
             return createIrAnonymousObject(klass)
@@ -258,7 +258,9 @@ class Fir2IrDeclarationStorage(
         val regularClass = klass as FirRegularClass
 
         val descriptor = WrappedClassDescriptor()
-        val origin = IrDeclarationOrigin.DEFINED
+        val origin =
+            if (exactlySourceClass || firProvider.getFirClassifierContainerFileIfAny(klass.symbol) != null) IrDeclarationOrigin.DEFINED
+            else IrDeclarationOrigin.IR_EXTERNAL_DECLARATION_STUB
         val visibility = regularClass.visibility
         val modality = if (regularClass.classKind == ClassKind.ENUM_CLASS) {
             regularClass.enumClassModality()
@@ -298,8 +300,8 @@ class Fir2IrDeclarationStorage(
         return irClass
     }
 
-    fun getIrClass(klass: FirClass<*>): IrClass {
-        return getCachedIrClass(klass) ?: createIrClass(klass)
+    fun getIrClass(klass: FirClass<*>, exactlySourceClass: Boolean = true): IrClass {
+        return getCachedIrClass(klass) ?: createIrClass(klass, exactlySourceClass)
     }
 
     private fun createIrAnonymousObject(

compiler/testData/ir/irText/stubs/constFromBuiltins.fir.txt

@@ -1,11 +0,0 @@
-FILE fqName:<root> fileName:/constFromBuiltins.kt
-  PROPERTY name:test visibility:public modality:FINAL [val]
-    FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]
-      EXPRESSION_BODY
-        CALL 'public final fun <get-MIN_VALUE> (): kotlin.Int declared in kotlin.Int.Companion' type=kotlin.Int origin=GET_PROPERTY
-          $this: GET_OBJECT 'CLASS OBJECT name:Companion modality:FINAL visibility:public [companion] superTypes:[kotlin.Any]' type=kotlin.Int.Companion
-    FUN DEFAULT_PROPERTY_ACCESSOR name:<get-test> visibility:public modality:FINAL <> () returnType:kotlin.Int
-      correspondingProperty: PROPERTY name:test visibility:public modality:FINAL [val]
-      BLOCK_BODY
-        RETURN type=kotlin.Nothing from='public final fun <get-test> (): kotlin.Int declared in <root>'
-          GET_FIELD 'FIELD PROPERTY_BACKING_FIELD name:test type:kotlin.Int visibility:private [final,static]' type=kotlin.Int origin=null

compiler/testData/ir/irText/stubs/constFromBuiltins.kt

@@ -1,3 +1,4 @@
+// FIR_IDENTICAL
 // DUMP_EXTERNAL_CLASS kotlin.Int
 
 val test = Int.MIN_VALUE