Update test ignore annotations for aarch64 (#1643)

Looks like everything is in general passing now so it's probably time to
close #1521 and all other remaining tests that are failing are
classified under new more focused issues.

Closes #1521

tests/all/fuzzing.rs

@@ -21,7 +21,7 @@ fn instantiate_empty_module_with_memory() {
 }
 
 #[test]
-#[cfg_attr(target_arch = "aarch64", should_panic)] // FIXME(#1521)
+#[cfg_attr(target_arch = "aarch64", should_panic)] // FIXME(#1523)
 fn instantiate_module_that_compiled_to_x64_has_register_32() {
     let mut config = Config::new();
     config.debug_info(true);