Analyze Data Flow: Support properties with custom accessors

#KT-11994 In Progress

compiler/frontend/src/org/jetbrains/kotlin/psi/KtParameter.java

@@ -183,7 +183,7 @@ public class KtParameter extends KtNamedDeclarationStub<KotlinParameterStub> imp
     }
 
     @Nullable
-    public KtFunction getOwnerFunction() {
+    public KtDeclarationWithBody getOwnerFunction() {
         PsiElement parent = getParentByStub();
         if (!(parent instanceof KtParameterList)) return null;
         return ((KtParameterList) parent).getOwnerFunction();

compiler/frontend/src/org/jetbrains/kotlin/psi/KtParameterList.java

@@ -74,10 +74,10 @@ public class KtParameterList extends KtElementImplStub<KotlinPlaceHolderStub<KtP
         removeParameter(getParameters().get(index));
     }
 
-    public KtFunction getOwnerFunction() {
+    public KtDeclarationWithBody getOwnerFunction() {
         PsiElement parent = getParentByStub();
-        if (!(parent instanceof KtFunction)) return null;
-        return (KtFunction) parent;
+        if (!(parent instanceof KtDeclarationWithBody)) return null;
+        return (KtDeclarationWithBody) parent;
     }
 
     @Nullable