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

CONFIG_CPU_HAS_LOAD_STORE_LR (not configurable)

configname: CONFIG_CPU_HAS_LOAD_STORE_LR

Linux Kernel Configuration
└─>Kernel type
└─>CPU_HAS_LOAD_STORE_LR
In linux kernel since version 3.10 (release Date: 2013-06-30)  
CPU has support for unaligned load and store instructions:
LWL, LWR, SWL, SWR (Load/store word left/right).
LDL, LDR, SDL, SDR (Load/store doubleword left/right, for 64bit systems).