CONFIG_BINFMT_IRIX is not available for thedefaultarchitecture x86.
Result is shown for architecture mips
default or selected kernelversion does not have config value CONFIG_BINFMT_IRIX.
Result is shown for kernelversion 5.4.123

Include IRIX binary compatibility

modulename: binfmt_irix.ko

configname: CONFIG_BINFMT_IRIX

Linux/MIPS Kernel Configuration
└─>Executable file formats
└─>Include IRIX binary compatibility
In linux kernel since version 2.6.12  
source code:
arch/mips/kernel/
depends
CONFIG_BROKEN
CONFIG_MIPS32
NOT CONFIG_CPU_LITTLE_ENDIAN