Added η-expander module and removed EAdd from grammar.

src/Codegen/Emits.hs

@@ -369,6 +369,7 @@ preludeFuns def (Ident xs) arg1 arg2
   | "$langle$$langle$" `isPrefixOf` xs = pure $ Icmp LLSlt I8 arg1 arg2
   | "$langle$" `isPrefixOf` xs =  pure $ Icmp LLSlt I64 arg1 arg2
   | "$minus$" `isPrefixOf` xs = pure $ Sub I64 arg1 arg2
+  | "$plus$" `isPrefixOf` xs = pure $ Add I64 arg1 arg2
   | "printChar$" `isPrefixOf` xs = do
         pure . UnsafeRaw $
             "add i16 0,0\n    call void (ptr, ...) @printf(ptr noundef @.char_print_no_nl, i8 noundef " <> toIr arg1 <> ")\n"