[FIR] Support fields as part of graph of class initialization

^KT-49747 Fixed

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/dfa/cfg/ControlFlowGraphBuilder.kt

@@ -408,6 +408,7 @@ class ControlFlowGraphBuilder {
         for (declaration in klass.declarations) {
             val graph = when (declaration) {
                 is FirProperty -> declaration.controlFlowGraphReference?.controlFlowGraph
+                is FirField -> declaration.controlFlowGraphReference?.controlFlowGraph
                 is FirAnonymousInitializer -> declaration.controlFlowGraphReference?.controlFlowGraph
                 else -> null
             } ?: continue
@@ -1556,7 +1557,7 @@ class ControlFlowGraphBuilder {
 
     private fun FirDeclaration.unwrap(): List<FirDeclaration> =
         when (this) {
-            is FirFunction, is FirAnonymousInitializer -> listOf(this)
+            is FirFunction, is FirAnonymousInitializer, is FirField -> listOf(this)
             is FirProperty -> listOfNotNull(this.getter, this.setter, this)
             else -> emptyList()
         }

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/FirDeclarationsResolveTransformer.kt

@@ -215,7 +215,9 @@ open class FirDeclarationsResolveTransformer(transformer: FirBodyResolveTransfor
             if (field.initializer != null) {
                 storeVariableReturnType(field)
             }
-            dataFlowAnalyzer.exitField(field)
+            dataFlowAnalyzer.exitField(field)?.let {
+                field.replaceControlFlowGraphReference(FirControlFlowGraphReferenceImpl(it))
+            }
             field
         }
     }

compiler/fir/resolve/src/org/jetbrains/kotlin/fir/resolve/transformers/body/resolve/LocalClassesNavigation.kt

@@ -75,6 +75,10 @@ private class NavigationInfoVisitor : FirDefaultVisitor<Unit, Any?>() {
         visitCallableDeclaration(property, null)
     }
 
+    override fun visitField(field: FirField, data: Any?) {
+        visitCallableDeclaration(field, null)
+    }
+
     override fun visitConstructor(constructor: FirConstructor, data: Any?) {
         visitCallableDeclaration(constructor, null)
     }