[IR generator] Don't use kotlinpoet for auto-generating IR tree classes

KT-61970 Fixed
KT-61703 Fixed

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/builder.kt

@@ -24,7 +24,6 @@ fun Builder.generateCode(generationPath: File): GeneratedFile =
         typeName,
         fileSuppressions = listOf("DuplicatedCode", "unused"),
     ) {
-        println()
         addAllImports(usedTypes)
         printBuilder(this@generateCode)
     }

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/element.kt

@@ -88,6 +88,5 @@ private class ElementPrinter(printer: SmartPrinter) : AbstractElementPrinter<Ele
 
 fun Element.generateCode(generationPath: File): GeneratedFile =
     printGeneratedType(generationPath, TREE_GENERATOR_README, packageName, typeName) {
-        println()
         ElementPrinter(this).printElement(element)
     }

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/implementation.kt

@@ -24,7 +24,6 @@ fun Implementation.generateCode(generationPath: File): GeneratedFile =
         this.typeName,
         fileSuppressions = listOf("DuplicatedCode", "unused"),
     ) {
-        println()
         addAllImports(usedTypes)
         printImplementation(this@generateCode)
     }

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/transformer.kt

@@ -106,6 +106,5 @@ fun printTransformer(elements: List<Element>, generationPath: File): GeneratedFi
         firTransformerType.packageName,
         firTransformerType.simpleName,
     ) {
-        println()
         TransformerPrinter(this).printVisitor(elements)
     }

compiler/fir/tree/tree-generator/src/org/jetbrains/kotlin/fir/tree/generator/printer/visitor.kt

@@ -120,6 +120,5 @@ private fun printVisitorCommon(
     makePrinter: (SmartPrinter, ClassRef<*>) -> AbstractVisitorPrinter<Element, Field>,
 ): GeneratedFile =
     printGeneratedType(generationPath, TREE_GENERATOR_README, visitorType.packageName, visitorType.simpleName) {
-        println()
         makePrinter(this, visitorType).printVisitor(elements)
     }