[IR] [JS_IR] Supported fun interfaces in JS

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

@@ -415,7 +415,7 @@ fun IrClass.createImplicitParameterDeclarationWithWrappedDescriptor() {
         startOffset, endOffset,
         IrDeclarationOrigin.INSTANCE_RECEIVER,
         IrValueParameterSymbolImpl(thisReceiverDescriptor),
-        Name.identifier("<this>"),
+        Name.special("<this>"),
         index = -1,
         type = symbol.typeWithParameters(typeParameters),
         varargElementType = null,

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

@@ -65,6 +65,8 @@ abstract class SingleAbstractMethodLowering(val context: CommonBackendContext) :
     abstract fun getSuperTypeForWrapper(typeOperand: IrType): IrType
 
     override fun lower(irFile: IrFile) {
+        cachedImplementations.clear()
+        inlineCachedImplementations.clear()
         enclosingContainer = irFile.declarations.filterIsInstance<IrClass>().find { it.isFileClass }
             ?: irFile
         irFile.transformChildrenVoid()