Use COPYRIGHT_HEADER in generateBuiltins

It's the same logic that is used in generateTests, and it prevents
master builds from failing as soon as the new year begins. The year in
the COPYRIGHT_HEADER should be updated manually anyway, after which all
the generators will need to be re-run.

generators/builtins/generateBuiltIns.kt

@@ -9,16 +9,14 @@ import org.jetbrains.kotlin.generators.builtins.arrayIterators.GenerateArrayIter
 import org.jetbrains.kotlin.generators.builtins.arrays.GenerateArrays
 import org.jetbrains.kotlin.generators.builtins.functions.GenerateFunctions
 import org.jetbrains.kotlin.generators.builtins.iterators.GenerateIterators
+import org.jetbrains.kotlin.generators.builtins.numbers.GenerateFloorDivMod
+import org.jetbrains.kotlin.generators.builtins.numbers.GeneratePrimitives
 import org.jetbrains.kotlin.generators.builtins.progressionIterators.GenerateProgressionIterators
 import org.jetbrains.kotlin.generators.builtins.progressions.GenerateProgressions
-import org.jetbrains.kotlin.generators.builtins.numbers.GeneratePrimitives
-import org.jetbrains.kotlin.generators.builtins.numbers.GenerateFloorDivMod
 import org.jetbrains.kotlin.generators.builtins.ranges.GenerateRanges
 import org.jetbrains.kotlin.generators.builtins.unsigned.generateUnsignedTypes
-import org.xml.sax.InputSource
 import java.io.File
 import java.io.PrintWriter
-import javax.xml.xpath.XPathFactory
 
 fun assertExists(file: File) {
     if (!file.exists()) error("Output dir does not exist: ${file.absolutePath}")
@@ -38,7 +36,8 @@ abstract class BuiltInsSourceGenerator(val out: PrintWriter) {
     protected open fun getMultifileClassName(): String? = null
 
     fun generate() {
-        out.println(readCopyrightNoticeFromProfile(File(".idea/copyright/apache.xml")))
+        out.println(File("license/COPYRIGHT_HEADER.txt").readText())
+        out.println()
         // Don't include generator class name in the message: these are built-in sources,
         // and we don't want to scare users with any internal information about our project
         out.println("// Auto-generated file. DO NOT EDIT!")
@@ -55,17 +54,6 @@ abstract class BuiltInsSourceGenerator(val out: PrintWriter) {
     }
 }
 
-fun readCopyrightNoticeFromProfile(copyrightProfile: File): String {
-    val template = copyrightProfile.reader().use { reader ->
-        XPathFactory.newInstance().newXPath().evaluate("/component/copyright/option[@name='notice']/@value", InputSource(reader))
-    }
-    val yearTemplate = "$today.year"
-    val year = java.time.LocalDate.now().year.toString()
-    assert(yearTemplate in template)
-
-    return template.replace(yearTemplate, year).lines().joinToString("", prefix = "/*\n", postfix = " */\n") { " * $it\n" }
-}
-
 fun generateBuiltIns(generate: (File, (PrintWriter) -> BuiltInsSourceGenerator) -> Unit) {
     assertExists(BUILT_INS_NATIVE_DIR)
     assertExists(BUILT_INS_SRC_DIR)