Minor, add utility to get class name from StringTable via ClassId

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

@@ -81,7 +81,7 @@ class AnnotationSerializer(private val stringTable: DescriptorAwareStringTable)
 
             override fun visitEnumValue(value: EnumValue, data: Unit) {
                 type = Type.ENUM
-                classId = stringTable.getQualifiedClassNameIndex(value.enumClassId.asString(), value.enumClassId.isLocal)
+                classId = stringTable.getQualifiedClassNameIndex(value.enumClassId)
                 enumValueId = stringTable.getStringIndex(value.enumEntryName.asString())
             }
 

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

@@ -13,16 +13,19 @@ import org.jetbrains.kotlin.resolve.descriptorUtil.classId
 import org.jetbrains.kotlin.types.ErrorUtils
 
 interface DescriptorAwareStringTable : StringTable {
+    fun getQualifiedClassNameIndex(classId: ClassId): Int =
+        getQualifiedClassNameIndex(classId.asString(), classId.isLocal)
+
     fun getFqNameIndex(descriptor: ClassifierDescriptorWithTypeParameters): Int {
         if (ErrorUtils.isError(descriptor)) {
             throw IllegalStateException("Cannot get FQ name of error class: ${renderDescriptor(descriptor)}")
         }
 
         val classId = descriptor.classId
-                ?: getLocalClassIdReplacement(descriptor)
-                ?: throw IllegalStateException("Cannot get FQ name of local class: ${renderDescriptor(descriptor)}")
+            ?: getLocalClassIdReplacement(descriptor)
+            ?: throw IllegalStateException("Cannot get FQ name of local class: ${renderDescriptor(descriptor)}")
 
-        return getQualifiedClassNameIndex(classId.asString(), classId.isLocal)
+        return getQualifiedClassNameIndex(classId)
     }
 
     fun getLocalClassIdReplacement(descriptor: ClassifierDescriptorWithTypeParameters): ClassId? = null

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

@@ -50,7 +50,7 @@ open class StringTableImpl : DescriptorAwareStringTable {
     override fun getQualifiedClassNameIndex(className: String, isLocal: Boolean): Int =
         getQualifiedClassNameIndex(ClassId.fromString(className, isLocal))
 
-    private fun getQualifiedClassNameIndex(classId: ClassId): Int {
+    override fun getQualifiedClassNameIndex(classId: ClassId): Int {
         val builder = QualifiedName.newBuilder()
         builder.kind = QualifiedName.Kind.CLASS