[gcc(refs/vendors/ARM/heads/gcs)] aarch64: Add __builtin_aarch64_chkfeat tests

https://gcc.gnu.org/g:0c0ee07e8b10e071c5b88fbae6f109778a4e578c commit 0c0ee07e8b10e071c5b88fbae6f109778a4e578c Author: Szabolcs Nagy Date: Fri Jun 2 16:15:25 2023 +0100 aarch64: Add __builtin_aarch64_chkfeat tests gcc/testsuite/ChangeLog: * gcc.target/aarch64/chkf

[gcc(refs/vendors/ARM/heads/gcs)] aarch64: Add __builtin_aarch64_chkfeat

https://gcc.gnu.org/g:e26ccd302f4face487da5b530d4dbeb4eebf7d43 commit e26ccd302f4face487da5b530d4dbeb4eebf7d43 Author: Szabolcs Nagy Date: Tue May 9 15:24:18 2023 +0100 aarch64: Add __builtin_aarch64_chkfeat Builtin for chkfeat: the input argument is used to initialize x16 then