[K/JS] Add support of compilation with ES-classes

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/ir/ValueRemapper.kt

@@ -30,6 +30,6 @@ abstract class AbstractValueRemapper : IrElementTransformerVoid() {
     }
 }
 
-open class ValueRemapper(private val map: Map<IrValueSymbol, IrValueSymbol>) : AbstractValueRemapper() {
+open class ValueRemapper(protected open val map: Map<IrValueSymbol, IrValueSymbol>) : AbstractValueRemapper() {
     override fun remapValue(oldValue: IrValueSymbol): IrValueSymbol? = map[oldValue]
 }

compiler/ir/backend.common/src/org/jetbrains/kotlin/backend/common/lower/InlineClassDeclarationLowering.kt

@@ -125,6 +125,13 @@ class InlineClassLowering(val context: CommonBackendContext) {
                                         return builder.irGet(initFunction.valueParameters.single())
                                     return expression
                                 }
+
+                                override fun visitSetValue(expression: IrSetValue): IrExpression {
+                                    expression.transformChildrenVoid()
+                                    if (expression.symbol == origParameterSymbol)
+                                        return builder.irSet(initFunction.valueParameters.single(), expression.value)
+                                    return expression
+                                }
                             })
                         }
                         +irReturn(unboxedInlineClassValue())