KT-11588 Type aliases

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

compiler/resolution/src/org/jetbrains/kotlin/resolve/scopes/Scopes.kt

@@ -73,6 +73,8 @@ enum class LexicalScopeKind(val withLocalDescriptors: Boolean) {
     FUNCTION_HEADER(false),
     FUNCTION_INNER_SCOPE(true),
 
+    TYPE_ALIAS_HEADER(false),
+
     CODE_BLOCK(true),
 
     LEFT_BOOLEAN_EXPRESSION(true),