Optimize synchronization for resolution anchors

Use volatile state instead of synchronized access to it.
This should be enough as the component's state is only read
by the component users and never changed.

idea/idea-analysis/src/org/jetbrains/kotlin/idea/caches/resolve/KotlinIdeResolutionAnchorService.kt

@@ -24,16 +24,17 @@ import org.jetbrains.kotlin.resolve.ResolutionAnchorProvider
 @State(name = "KotlinIdeAnchorService", storages = [Storage("anchors.xml")])
 class KotlinIdeResolutionAnchorService(
     val project: Project
-) : ResolutionAnchorProvider, 
+) : ResolutionAnchorProvider,
     PersistentStateComponent<KotlinIdeResolutionAnchorService.State> {
 
     data class State(
         var moduleNameToAnchorName: Map<String, String> = emptyMap()
     )
-    
+
     private val logger = logger<KotlinIdeResolutionAnchorService>()
 
     @JvmField
+    @Volatile
     var myState: State = State()
 
     private fun buildMapping(): Map<ModuleInfo, ModuleInfo> {
@@ -52,7 +53,7 @@ class KotlinIdeResolutionAnchorService(
             module to anchor
         }.toMap()
     }
-    
+
     private fun notFoundModule(moduleName: String): Nothing? {
         logger.warn("Module <${moduleName}> not found in project model")
         return null
@@ -63,15 +64,12 @@ class KotlinIdeResolutionAnchorService(
             buildMapping()
         }
 
-    @Synchronized
     override fun getState(): State = myState
 
-    @Synchronized
     override fun loadState(state: State) {
         XmlSerializerUtil.copyBean(state, myState)
     }
 
-    @Synchronized
     override fun getResolutionAnchor(moduleDescriptor: ModuleDescriptor): ModuleDescriptor? {
         if (!project.libraryToSourceAnalysisEnabled) return null
         val moduleInfo = moduleDescriptor.moduleInfo ?: return null