[FIR]: sealed hierarchy processor for IDE

From now on sealed declarations get resolved with the help of
FirIdeSealedHierarchyProcessor. This change entails correct IDE side
check for sealed when exhaustiveness.

generators/tests/org/jetbrains/kotlin/generators/tests/GenerateTests.kt

@@ -79,6 +79,7 @@ import org.jetbrains.kotlin.idea.editor.backspaceHandler.AbstractBackspaceHandle
 import org.jetbrains.kotlin.idea.editor.quickDoc.AbstractQuickDocProviderTest
 import org.jetbrains.kotlin.idea.filters.AbstractKotlinExceptionFilterTest
 import org.jetbrains.kotlin.idea.fir.AbstractKtDeclarationAndFirDeclarationEqualityChecker
+import org.jetbrains.kotlin.idea.fir.low.level.api.*
 import org.jetbrains.kotlin.idea.fir.low.level.api.AbstractFirLazyDeclarationResolveTest
 import org.jetbrains.kotlin.idea.fir.low.level.api.AbstractFirLazyResolveTest
 import org.jetbrains.kotlin.idea.fir.low.level.api.AbstractFirMultiModuleLazyResolveTest
@@ -1062,6 +1063,9 @@ fun main(args: Array<String>) {
             testClass<AbstractFirMultiModuleLazyResolveTest> {
                 model("multiModuleLazyResolve", recursive = false, extension = null)
             }
+            testClass<AbstractFirSealedInheritorsTest> {
+                model("resolveSealed", recursive = false, extension = null)
+            }
             testClass<AbstractFirLazyDeclarationResolveTest> {
                 model("lazyResolve")
             }