Codegen should just skip (local) type alias declarations.

compiler/testData/codegen/box/typealias/localTypeAlias.kt

@@ -0,0 +1,16 @@
+class Cell<TC>(val x: TC)
+
+object OkHost {
+    val value = "OK"
+}
+
+fun <T> id(x: T): T {
+    typealias C = Cell<T>
+    val c: C = C(x)
+    return c.x
+}
+
+fun box(): String {
+    typealias OK = OkHost
+    return id(OK.value)
+}