[FIR] Don't add annotations from IR plugin to metadata of synthetic f…

…unctions

Synthetic functions (like delegated or data class members) might have
  offsets equal to offsets of some real declaration, which may cause
  clashes with some real declarations with added annotations. Ideally
  we shouldn't use offsets as keys at all, but it will be addressed
  later (KT-72957)

^KT-72804

compiler/fir/fir2ir/src/org/jetbrains/kotlin/fir/backend/Fir2IrIrGeneratedDeclarationsRegistrar.kt

@@ -6,6 +6,7 @@
 package org.jetbrains.kotlin.fir.backend
 
 import org.jetbrains.kotlin.GeneratedDeclarationKey
+import org.jetbrains.kotlin.KtFakeSourceElementKind
 import org.jetbrains.kotlin.KtSourceElement
 import org.jetbrains.kotlin.backend.common.extensions.IrGeneratedDeclarationsRegistrar
 import org.jetbrains.kotlin.descriptors.Modality
@@ -509,6 +510,12 @@ class Fir2IrIrGeneratedDeclarationsRegistrar(private val components: Fir2IrCompo
         }
 
         private fun extractGeneratedIrDeclarations(declaration: FirDeclaration): List<IrConstructorCall> {
+            when (declaration.origin) {
+                is FirDeclarationOrigin.Synthetic,
+                is FirDeclarationOrigin.Delegated
+                    -> return emptyList()
+                else -> {}
+            }
             val firFile = declaration.containingFile() ?: return emptyList()
             val fileFqName = firFile.packageFqName.child(Name.identifier(firFile.name)).asString()
             val source = declaration.source ?: return emptyList()