[libc] Memory function benchmarks: rename MemcmpConfiguration in MemcmpOrBcmpConfiguration

This will help make sense of the double use of the same type in https://reviews.llvm.org/D111622#inline-1065560.

Differential Revision: https://reviews.llvm.org/D111868

GitOrigin-RevId: 4a9bcb605b32e9bde2ddc9fe5b9bfefa11f49831
4 files changed