KT-20506: Fix completion suggests the same value recursively

Check for excludeNonInitializedVariable via PSI, not by
descriptors equality, because of bindingContext caching

#KT-20506 fixed

idea/ide-common/src/org/jetbrains/kotlin/idea/codeInsight/ReferenceVariantsHelper.kt

@@ -21,6 +21,7 @@ import org.jetbrains.kotlin.descriptors.*
 import org.jetbrains.kotlin.idea.resolve.ResolutionFacade
 import org.jetbrains.kotlin.idea.resolve.frontendService
 import org.jetbrains.kotlin.idea.util.*
+import org.jetbrains.kotlin.js.resolve.diagnostics.findPsi
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.FqNameUnsafe
 import org.jetbrains.kotlin.name.Name
@@ -118,8 +119,7 @@ class ReferenceVariantsHelper(
         for (element in contextElement.parentsWithSelf) {
             val parent = element.parent
             if (parent is KtVariableDeclaration && element == parent.initializer) {
-                val descriptor = bindingContext[BindingContext.DECLARATION_TO_DESCRIPTOR, parent]
-                return variants.filter { it != descriptor }
+                return variants.filter { it.findPsi() != parent }
             }
             if (element is KtDeclaration) break // we can use variable inside lambda or anonymous object located in its initializer
         }