[sil-mode] Add syntax highlighting for convert_escape_to_noescape

Author: gottesmm

utils/sil-mode.el

@@ -151,7 +151,7 @@
                     "unchecked_bitwise_cast"
                     "ref_to_raw_pointer" "raw_pointer_to_ref"
                     "unowned_to_ref" "ref_to_unowned"
-                    "convert_function"
+                    "convert_function" "convert_escape_to_noescape"
                     "ref_to_unmanaged" "unmanaged_to_ref"
                     "thin_function_to_pointer" "pointer_to_thin_function"
                     "ref_to_bridge_object"