CONFIG_SYS_HAS_CPU_LOONGSON2 is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_SYS_HAS_CPU_LOONGSON2.
Result is shown for kernelversion 5.3.7

CONFIG_SYS_HAS_CPU_LOONGSON2 (not configurable)

configname: CONFIG_SYS_HAS_CPU_LOONGSON2

Linux/MIPS Kernel Configuration
└─>CPU selection
└─>SYS_HAS_CPU_LOONGSON2
In linux kernel since version 2.6.23 (release Date: 2007-10-09)  
is selected by
CONFIG_CPU_LOONGSON2