Underlying constructor for type alias should always be substituted

Otherwise PSI2IR fails because of type mismatch.

compiler/ir/ir.tree/src/org/jetbrains/kotlin/ir/util/SymbolTable.kt

@@ -100,7 +100,8 @@ class SymbolTable {
         private var currentScope: Scope? = null
 
         override fun get(d: D): S? {
-            val scope = currentScope ?: throw AssertionError("No active scope")
+            val scope = currentScope
+                    ?: throw AssertionError("No active scope")
             return scope[d]
         }