FIR IDE: allow getting light class name from EDT

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/classes/FirLightClassForClassOrObjectSymbol.kt

@@ -120,7 +120,7 @@ internal abstract class FirLightClassForClassOrObjectSymbol(
 
     abstract override fun hashCode(): Int
 
-    override fun getName(): String? = classOrObjectSymbol.name.asString()
+    override fun getName(): String? = allowLightClassesOnEdt { classOrObjectSymbol.name.asString() }
 
     override fun hasModifierProperty(@NonNls name: String): Boolean = modifierList?.hasModifierProperty(name) ?: false
 

idea/idea-frontend-fir/src/org/jetbrains/kotlin/idea/asJava/lightClassUtils.kt

@@ -0,0 +1,12 @@
+/*
+ * Copyright 2010-2020 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ * Use of this source code is governed by the Apache 2.0 license that can be found in the license/LICENSE.txt file.
+ */
+
+package org.jetbrains.kotlin.idea.asJava
+
+import org.jetbrains.kotlin.idea.frontend.api.HackToForceAllowRunningAnalyzeOnEDT
+import org.jetbrains.kotlin.idea.frontend.api.hackyAllowRunningOnEdt
+
+@OptIn(HackToForceAllowRunningAnalyzeOnEDT::class)
+internal inline fun <E> allowLightClassesOnEdt(action: () -> E): E = hackyAllowRunningOnEdt(action)