[FIR] Add deserialization of inheritors of sealed classes

compiler/testData/loadJava/compiledKotlin/class/SealedClass.kt

@@ -0,0 +1,9 @@
+package test
+
+class Inheritor3 : SealedClass()
+
+sealed class SealedClass {
+    class Inheritor1 : SealedClass()
+}
+
+class Inheritor2 : SealedClass()

compiler/testData/loadJava/compiledKotlin/class/SealedClass.txt

@@ -0,0 +1,17 @@
+package test
+
+public final class Inheritor2 : test.SealedClass {
+    /*primary*/ public constructor Inheritor2()
+}
+
+public final class Inheritor3 : test.SealedClass {
+    /*primary*/ public constructor Inheritor3()
+}
+
+public sealed class SealedClass {
+    /*primary*/ private constructor SealedClass()
+
+    public final class Inheritor1 : test.SealedClass {
+        /*primary*/ public constructor Inheritor1()
+    }
+}