KT-11588 Type aliases

Resolution & expansion for type aliases.
NB: Nested type aliases capturing type parameters of outer classes are not supported yet.

compiler/tests-common/org/jetbrains/kotlin/test/util/DescriptorValidator.java

@@ -273,6 +273,14 @@ public class DescriptorValidator {
             return true;
         }
 
+        @Override
+        public Boolean visitTypeAliasDescriptor(
+                TypeAliasDescriptor descriptor, DiagnosticCollector data
+        ) {
+            // TODO typealias
+            return true;
+        }
+
         @Override
         public Boolean visitModuleDeclaration(
                 ModuleDescriptor descriptor, DiagnosticCollector collector
@@ -436,6 +444,12 @@ public class DescriptorValidator {
             return null;
         }
 
+        @Override
+        public Void visitTypeAliasDescriptor(TypeAliasDescriptor descriptor, MemberScope data) {
+            // TODO typealias
+            return null;
+        }
+
         @Override
         public Void visitModuleDeclaration(
                 ModuleDescriptor descriptor, MemberScope scope

compiler/tests-common/org/jetbrains/kotlin/test/util/RecursiveDescriptorProcessor.java

@@ -109,6 +109,12 @@ public class RecursiveDescriptorProcessor {
                    && visitChildren(DescriptorUtils.getAllDescriptors(descriptor.getDefaultType().getMemberScope()), data);
         }
 
+        @Override
+        public Boolean visitTypeAliasDescriptor(TypeAliasDescriptor descriptor, D data) {
+            // TODO typealias
+            return true;
+        }
+
         @Override
         public Boolean visitModuleDeclaration(ModuleDescriptor descriptor, D data) {
             return applyWorker(descriptor, data)