CONFIG_ARC_HAS_SWAPE is not available for thedefaultarchitecture x86.
Result is shown for architecture arc

Insn: SWAPE (endian-swap)

configname: CONFIG_ARC_HAS_SWAPE

Linux Kernel Configuration
└─>ARC Architecture Configuration
└─>ARC CPU Configuration
└─>Enable support for Rel 4.10 features
└─>Insn: SWAPE (endian-swap)
In linux kernel since version 3.1 (release Date: 2011-10-24)