CONFIG_SYS_HAS_CPU_XLR is not available for thedefaultarchitecture x86.
Result is shown for architecture mips

CONFIG_SYS_HAS_CPU_XLR (not configurable)

configname: CONFIG_SYS_HAS_CPU_XLR

Linux Kernel Configuration
└─>CPU selection
└─>SYS_HAS_CPU_XLR
In linux kernel since version 3 (release Date: 2011-07-21)