[JS IR]Add check on pureness to not calculate fields to expression twice

^KT-43222 fixed

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/JsMapping.kt

@@ -8,8 +8,6 @@ package org.jetbrains.kotlin.ir.backend.js
 import org.jetbrains.kotlin.backend.common.DefaultMapping
 import org.jetbrains.kotlin.backend.common.Mapping
 import org.jetbrains.kotlin.ir.declarations.*
-import org.jetbrains.kotlin.ir.expressions.IrExpression
-import org.jetbrains.kotlin.ir.expressions.IrExpressionBody
 
 class JsMapping : DefaultMapping() {
     val outerThisFieldSymbols = newMapping<IrClass, IrField>()
@@ -32,8 +30,6 @@ class JsMapping : DefaultMapping() {
     val enumEntryToCorrespondingField = newMapping<IrEnumEntry, IrField>()
     val enumClassToInitEntryInstancesFun = newMapping<IrClass, IrSimpleFunction>()
 
-    val lazyInitialisedFields = newMapping<IrField, IrExpression>()
-
     // Triggers `StageController.lazyLower` on access
     override fun <K : IrDeclaration, V> newMapping(): Mapping.Delegate<K, V> = object : Mapping.Delegate<K, V>() {
         private val map: MutableMap<K, V> = mutableMapOf()

compiler/ir/backend.js/src/org/jetbrains/kotlin/ir/backend/js/lower/PropertyLazyInitLowering.kt

@@ -51,11 +51,13 @@ class PropertyLazyInitLowering(
         val file = container.parent as? IrFile
             ?: return
 
-        val initFun = (if (file in fileToInitialisationFuns) {
-            fileToInitialisationFuns[file]
-        } else {
-            createInitialisationFunction(file).also {
-                fileToInitialisationFuns[file] = it
+        val initFun = (when {
+            file in fileToInitialisationFuns -> fileToInitialisationFuns[file]
+            fileToPurenessInitializers[file] == true -> null
+            else -> {
+                createInitialisationFunction(file).also {
+                    fileToInitialisationFuns[file] = it
+                }
             }
         }) ?: return
 
@@ -95,6 +97,7 @@ class PropertyLazyInitLowering(
         if (fieldToInitializer.isEmpty()) return null
 
         val allFieldsInFilePure = allFieldsInFilePure(fieldToInitializer.values)
+        fileToPurenessInitializers[file] = allFieldsInFilePure
         if (allFieldsInFilePure) {
             return null
         }