[JS IR] Implement shared box intrinsics translator

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/transformers/irToJs/JsIntrinsicTransformers.kt

@@ -218,6 +218,23 @@ class JsIntrinsicTransformers(backendContext: JsIrBackendContext) {
             add(intrinsics.unreachable) { _, _ ->
                 JsInvocation(JsNameRef(Namer.UNREACHABLE_NAME))
             }
+
+            add(intrinsics.createSharedBox) { call, context: JsGenerationContext ->
+                val arg = translateCallArguments(call, context).single()
+                JsObjectLiteral(listOf(JsPropertyInitializer(JsNameRef(Namer.SHARED_BOX_V), arg)))
+            }
+
+            add(intrinsics.readSharedBox) { call, context: JsGenerationContext ->
+                val box = translateCallArguments(call, context).single()
+                JsNameRef(Namer.SHARED_BOX_V, box)
+            }
+
+            add(intrinsics.writeSharedBox) { call, context: JsGenerationContext ->
+                val args = translateCallArguments(call, context)
+                val box = args[0]
+                val value = args[1]
+                jsAssignment(JsNameRef(Namer.SHARED_BOX_V, box), value)
+            }
         }
     }
 

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/utils/Namer.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.ir.backend.js.utils
 
-import org.jetbrains.kotlin.idea.KotlinLanguage
 import org.jetbrains.kotlin.js.backend.ast.JsNameRef
 
 object Namer {
@@ -43,4 +42,6 @@ object Namer {
     val KPROPERTY_SET = "set"
     val KCALLABLE_CACHE_SUFFIX = "\$cache"
     const val KCALLABLE_ARITY = "\$arity"
+
+    const val SHARED_BOX_V = "_v"
 }