Reverted old behaviour of DescriptorToSourceUtils.descriptorToDeclaration()

compiler/frontend/src/org/jetbrains/kotlin/resolve/DescriptorToSourceUtils.kt

@@ -59,17 +59,12 @@ public object DescriptorToSourceUtils {
 
     // NOTE this is also used by KDoc
     // Returns PSI element for descriptor. If there are many relevant elements (e.g. it is fake override
-    // with multiple declarations), finds any of them. It can't find declarations in builtins or decompiled code.
+    // with multiple declarations), returns null. It can't find declarations in builtins or decompiled code.
     // In IDE, use DescriptorToSourceUtilsIde instead.
     platformStatic
     public fun descriptorToDeclaration(descriptor: DeclarationDescriptor): PsiElement? {
-        for (declarationDescriptor in getEffectiveReferencedDescriptors(descriptor.getOriginal())) {
-            val source = getSourceFromDescriptor(declarationDescriptor)
-            if (source != null) {
-                return source
-            }
-        }
-        return null
+        val effectiveReferencedDescriptors = getEffectiveReferencedDescriptors(descriptor)
+        return if (effectiveReferencedDescriptors.size() == 1) getSourceFromDescriptor(effectiveReferencedDescriptors.firstOrNull()!!) else null
     }
 
     platformStatic