Improve hack in BuiltInsSerializerExtension for ranges

Serialize class names as qualified names in the string table, not as
simple strings. Otherwise NameResolverImpl crashes on deserialization
because it expects that all class names are indices into QualifiedName
table

compiler/serialization/src/org/jetbrains/kotlin/serialization/StringTable.kt

@@ -16,9 +16,7 @@
 
 package org.jetbrains.kotlin.serialization
 
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ClassifierDescriptorWithTypeParameters
-
 import java.io.OutputStream
 
 interface StringTable {

compiler/serialization/src/org/jetbrains/kotlin/serialization/StringTableImpl.kt

@@ -16,11 +16,11 @@
 
 package org.jetbrains.kotlin.serialization
 
-import org.jetbrains.kotlin.descriptors.ClassDescriptor
 import org.jetbrains.kotlin.descriptors.ClassifierDescriptorWithTypeParameters
-import org.jetbrains.kotlin.descriptors.PackageFragmentDescriptor
+import org.jetbrains.kotlin.name.ClassId
 import org.jetbrains.kotlin.name.FqName
 import org.jetbrains.kotlin.name.Name
+import org.jetbrains.kotlin.resolve.descriptorUtil.classId
 import org.jetbrains.kotlin.serialization.ProtoBuf.QualifiedNameTable.QualifiedName
 import org.jetbrains.kotlin.types.ErrorUtils
 import org.jetbrains.kotlin.utils.Interner
@@ -58,24 +58,19 @@ open class StringTableImpl : StringTable {
             throw IllegalStateException("Cannot get FQ name of error class: $descriptor")
         }
 
+        val classId = descriptor.classId ?: return getFqNameIndexOfLocalAnonymousClass(descriptor)
+        return getClassIdIndex(classId)
+    }
+
+    fun getClassIdIndex(classId: ClassId): Int {
         val builder = QualifiedName.newBuilder()
         builder.kind = QualifiedName.Kind.CLASS
 
-        val containingDeclaration = descriptor.containingDeclaration
-        when (containingDeclaration) {
-            is PackageFragmentDescriptor -> {
-                val packageFqName = containingDeclaration.fqName
-                if (!packageFqName.isRoot) {
-                    builder.parentQualifiedName = getPackageFqNameIndex(packageFqName)
-                }
-            }
-            is ClassDescriptor -> {
-                builder.parentQualifiedName = getFqNameIndex(containingDeclaration)
-            }
-            else -> return getFqNameIndexOfLocalAnonymousClass(descriptor)
-        }
+        builder.parentQualifiedName =
+                classId.outerClassId?.let(this::getClassIdIndex)
+                ?: getPackageFqNameIndex(classId.packageFqName)
 
-        builder.shortName = getStringIndex(descriptor.name.asString())
+        builder.shortName = getStringIndex(classId.shortClassName.asString())
 
         return qualifiedNames.intern(FqNameProto(builder))
     }