skip nanobenchmarks if rdtscp is not supported. Refs https://github.com/libjxl/libjxl/issues/408, thanks @error256
skip nanobenchmarks if rdtscp is not supported. Refs https://github.com/libjxl/libjxl/issues/408, thanks @error256

PiperOrigin-RevId: 394187316

google/highway,google/highway,google/highway