[FIR] Change visibility of default sealed class constructor to private

compiler/fir/lightTree/src/org/jetbrains/kotlin/fir/lightTree/fir/ClassWrapper.kt

@@ -59,7 +59,7 @@ class ClassWrapper(
     fun defaultConstructorVisibility(): Visibility {
         return when {
             isObject() || isEnum() -> Visibilities.PRIVATE
-            isSealed() -> Visibilities.PUBLIC
+            isSealed() -> Visibilities.PRIVATE
             else -> Visibilities.UNKNOWN
         }
     }

compiler/fir/psi2fir/src/org/jetbrains/kotlin/fir/builder/RawFirBuilder.kt

@@ -464,7 +464,7 @@ class RawFirBuilder(session: FirSession, val baseScopeProvider: FirScopeProvider
             fun defaultVisibility() = when {
                 // TODO: object / enum is HIDDEN (?)
                 owner is KtObjectDeclaration || owner.hasModifier(ENUM_KEYWORD) -> Visibilities.PRIVATE
-                owner.hasModifier(SEALED_KEYWORD) -> Visibilities.PUBLIC
+                owner.hasModifier(SEALED_KEYWORD) -> Visibilities.PRIVATE
                 else -> Visibilities.UNKNOWN
             }
 

compiler/fir/resolve/testData/resolve/exhaustiveness_sealedClass.txt

@@ -1,6 +1,6 @@
 FILE: exhaustiveness_sealedClass.kt
     public sealed class Base : R|kotlin/Any| {
-        public constructor(): R|Base| {
+        private constructor(): R|Base| {
             super<R|kotlin/Any|>()
         }
 

compiler/fir/resolve/testData/resolve/expresssions/classifierAccessFromCompanion.txt

@@ -5,7 +5,7 @@ FILE: classifierAccessFromCompanion.kt
         }
 
         public sealed class Function : R|kotlin/Any| {
-            public constructor(): R|Factory.Function| {
+            private constructor(): R|Factory.Function| {
                 super<R|kotlin/Any|>()
             }
 

compiler/fir/resolve/testData/resolve/multifile/sealedStarImport.txt

@@ -1,6 +1,6 @@
 FILE: test.kt
     public sealed class Test : R|kotlin/Any| {
-        public constructor(): R|test/Test| {
+        private constructor(): R|test/Test| {
             super<R|kotlin/Any|>()
         }
 

compiler/fir/resolve/testData/resolve/recursiveCallOnWhenWithSealedClass.txt

@@ -1,6 +1,6 @@
 FILE: recursiveCallOnWhenWithSealedClass.kt
     public sealed class Maybe<T> : R|kotlin/Any| {
-        public constructor<T>(): R|Maybe<T>| {
+        private constructor<T>(): R|Maybe<T>| {
             super<R|kotlin/Any|>()
         }