CONFIG_AS_HAS_PAC is not available for thedefaultarchitecture x86.
Result is shown for architecture arm64
default or selected kernelversion does not have config value CONFIG_AS_HAS_PAC.
Result is shown for kernelversion 6.9.9

CONFIG_AS_HAS_PAC (not configurable)

configname: CONFIG_AS_HAS_PAC

Linux Kernel Configuration
└─>Kernel Features
└─>ARMv8.3 architectural features
└─>AS_HAS_PAC
In linux kernel since version 5.1 (release Date: 2019-05-05)