Safe Delete: Suppress walking through light field initializer

This fixes some tests failing in 173 branch

 #KT-21508 Fixed

idea/src/org/jetbrains/kotlin/idea/refactoring/safeDelete/KotlinSafeDeleteProcessor.kt

@@ -35,6 +35,8 @@ import com.intellij.refactoring.safeDelete.usageInfo.SafeDeleteReferenceSimpleDe
 import com.intellij.usageView.UsageInfo
 import org.jetbrains.annotations.TestOnly
 import org.jetbrains.kotlin.asJava.*
+import org.jetbrains.kotlin.asJava.elements.KtLightField
+import org.jetbrains.kotlin.asJava.elements.KtLightFieldImpl
 import org.jetbrains.kotlin.descriptors.CallableMemberDescriptor
 import org.jetbrains.kotlin.descriptors.Modality
 import org.jetbrains.kotlin.idea.KotlinBundle
@@ -134,7 +136,15 @@ class KotlinSafeDeleteProcessor : JavaSafeDeleteProcessor() {
 
         fun findUsagesByJavaProcessor(element: PsiElement, forceReferencedElementUnwrapping: Boolean): NonCodeUsageSearchInfo? {
             val javaUsages = ArrayList<UsageInfo>()
-            val searchInfo = super.findUsages(element, asLightElements(allElementsToDelete), javaUsages)
+
+            val elementToPassToJava = when (element) {
+                is KtLightFieldImpl<*> -> object : KtLightField by element {
+                    // Suppress walking through initializer compiled PSI (it doesn't contain any reference expressions anyway)
+                    override fun getInitializer() = null
+                }
+                else -> element
+            }
+            val searchInfo = super.findUsages(elementToPassToJava, asLightElements(allElementsToDelete), javaUsages)
 
             javaUsages.filterIsInstance<SafeDeleteOverridingMethodUsageInfo>().mapNotNullTo(deleteSet) { it.element }