Exposing the endianness of the host system in System.Info

Knowing the endianness of your system is useful in cases where endianness matters, such as network serialization protocols, which are big-endian by default (network order).

I would like to suggest that the host system's endianness is exported by the build system from Hadrian to base via CPP, so that it is a runtime constant located in System.Info

I am willing to submit a patch and go through the CLC process.