K2: fix field annotation splitting and frontend checks

Related to KT-57135

compiler/fir/tree/src/org/jetbrains/kotlin/fir/renderer/FirRenderer.kt

@@ -199,6 +199,13 @@ class FirRenderer(
         override fun visitCallableDeclaration(callableDeclaration: FirCallableDeclaration) {
             renderContexts(callableDeclaration.contextReceivers)
             annotationRenderer?.render(callableDeclaration)
+            if (callableDeclaration is FirProperty) {
+                val backingField = callableDeclaration.backingField
+                if (backingField?.annotations?.isNotEmpty() == true) {
+                    print("field:")
+                    annotationRenderer?.render(backingField)
+                }
+            }
             visitMemberDeclaration(callableDeclaration)
             val receiverParameter = callableDeclaration.receiverParameter
             if (callableDeclaration !is FirProperty || callableDeclaration.isCatchParameter != true) {

compiler/fir/tree/src/org/jetbrains/kotlin/fir/symbols/impl/FirVariableSymbol.kt

@@ -38,6 +38,12 @@ open class FirPropertySymbol(
     val delegateFieldSymbol: FirDelegateFieldSymbol?
         get() = fir.delegateFieldSymbol
 
+    val delegate: FirExpression?
+        get() = fir.delegate
+
+    val hasDelegate: Boolean
+        get() = fir.delegate != null
+
     val hasInitializer: Boolean
         get() = fir.initializer != null
 
@@ -47,9 +53,6 @@ open class FirPropertySymbol(
             return fir.initializer
         }
 
-    val hasDelegate: Boolean
-        get() = fir.delegate != null
-
     val controlFlowGraphReference: FirControlFlowGraphReference?
         get() {
             lazyResolveToPhase(FirResolvePhase.BODY_RESOLVE)