FIR: support inline classes + render class attributes nicer

compiler/fir/tree/src/org/jetbrains/kotlin/fir/FirRenderer.kt

@@ -143,7 +143,20 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
         if (memberDeclaration is FirCallableMember && memberDeclaration.isOverride) {
             print("override ")
         }
-        if (memberDeclaration is FirNamedFunction) {
+        if (memberDeclaration is FirClass) {
+            if (memberDeclaration.isInner) {
+                print("inner ")
+            }
+            if (memberDeclaration.isCompanion) {
+                print("companion ")
+            }
+            if (memberDeclaration.isData) {
+                print("data ")
+            }
+            if (memberDeclaration.isInline) {
+                print("inline ")
+            }
+        } else if (memberDeclaration is FirNamedFunction) {
             if (memberDeclaration.isOperator) {
                 print("operator ")
             }
@@ -194,12 +207,6 @@ class FirRenderer(builder: StringBuilder) : FirVisitorVoid() {
 
     override fun visitClass(klass: FirClass) {
         visitMemberDeclaration(klass)
-        val attributes = listOfNotNull(
-            "inner".takeIf { klass.isInner },
-            "companion".takeIf { klass.isCompanion },
-            "data".takeIf { klass.isData }
-        )
-        print(attributes.joinToString(prefix = "(", postfix = ")"))
         if (klass.superTypes.isNotEmpty()) {
             print(" : ")
             klass.superTypes.renderSeparated()

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/FirClass.kt

@@ -27,6 +27,8 @@ interface FirClass : FirDeclarationContainer, FirMemberDeclaration, FirSymbolOwn
 
     val isData: Boolean
 
+    val isInline: Boolean
+
     override val symbol: FirClassSymbol
 
     override fun <R, D> accept(visitor: FirVisitor<R, D>, data: D): R =

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirClassImpl.kt

@@ -30,7 +30,8 @@ open class FirClassImpl(
     final override val classKind: ClassKind,
     final override val isInner: Boolean,
     final override val isCompanion: Boolean,
-    final override val isData: Boolean
+    final override val isData: Boolean,
+    override val isInline: Boolean
 ) : FirAbstractMemberDeclaration(session, psi, name, visibility, modality, platformStatus), FirClass {
 
     init {

compiler/fir/tree/src/org/jetbrains/kotlin/fir/declarations/impl/FirEnumEntryImpl.kt

@@ -32,7 +32,8 @@ class FirEnumEntryImpl(
     classKind = ClassKind.ENUM_ENTRY,
     isInner = false,
     isCompanion = false,
-    isData = false
+    isData = false,
+    isInline = false
 ), FirEnumEntry {
     override val arguments = mutableListOf<FirExpression>()
 }