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

CONFIG_WAR_ICACHE_REFILLS (not configurable)

configname: CONFIG_WAR_ICACHE_REFILLS

Linux Kernel Configuration
└─>Kernel type
└─>WAR_ICACHE_REFILLS
In linux kernel since version 5.1 (release Date: 2019-05-05)  
is depended by
CONFIG_SGI_IP32