Benchmarks without tests

[WojciechMula]

CMakeLists.txt has the condition disallowing benchmarks without test:

message(STATUS "You have enabled the benchmarks, but not the tests. We don't allow running the benchmarks without the tests.")

What is the rationale? TBH, this seems to be an artificial restriction.

[lemire]

@WojciechMula We can lift it but the idea is that you shouldn’t benchmark incorrect code.

[WojciechMula]

Think about scenario, when you already validated the given backend, and want to benchmark it on multiple different machines.