Treat SEALED_SUBCLASS_FQ_NAME_LIST change as a class signature change

#KT-19580

jps-plugin/testData/incremental/classHierarchyAffected/sealedClassNestedImplAdded/Base.kt

@@ -0,0 +1,4 @@
+sealed class Base {
+    class A : Base()
+    class B : Base()
+}

jps-plugin/testData/incremental/classHierarchyAffected/sealedClassNestedImplAdded/Base.kt.new.1

@@ -0,0 +1,5 @@
+sealed class Base {
+    class A : Base()
+    class B : Base()
+    class C : Base()
+}

jps-plugin/testData/incremental/classHierarchyAffected/sealedClassNestedImplAdded/build.log

@@ -0,0 +1,40 @@
+================ Step #1 =================
+
+Cleaning output files:
+  out/production/module/Base$A.class
+  out/production/module/Base$B.class
+  out/production/module/Base.class
+End of files
+Compiling files:
+  src/Base.kt
+End of files
+Marked as dirty by Kotlin:
+  src/use.kt
+Exit code: ADDITIONAL_PASS_REQUIRED
+------------------------------------------
+Cleaning output files:
+  out/production/module/META-INF/module.kotlin_module
+  out/production/module/UseKt.class
+End of files
+Compiling files:
+  src/use.kt
+End of files
+Exit code: ABORT
+------------------------------------------
+COMPILATION FAILED
+'when' expression must be exhaustive, add necessary 'is C' branch or 'else' branch instead
+
+================ Step #2 =================
+
+Cleaning output files:
+  out/production/module/Base$A.class
+  out/production/module/Base$B.class
+  out/production/module/Base$C.class
+  out/production/module/Base.class
+End of files
+Compiling files:
+  src/Base.kt
+  src/use.kt
+End of files
+Exit code: OK
+------------------------------------------

jps-plugin/testData/incremental/classHierarchyAffected/sealedClassNestedImplAdded/use.kt

@@ -0,0 +1,7 @@
+import Base.*
+
+fun use(x: Base): String =
+        when (x) {
+            is A -> "A"
+            is B -> "B"
+        }

jps-plugin/testData/incremental/classHierarchyAffected/sealedClassNestedImplAdded/use.kt.new.2

@@ -0,0 +1,8 @@
+import Base.*
+
+fun use(x: Base): String =
+        when (x) {
+            is A -> "A"
+            is B -> "B"
+            is C -> "C"
+        }