b17e644eed
This PR adds support of [RAND](https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gfortran/RAND.html), [IRAND](https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gfortran/IRAND.html) and [SRAND](https://gcc.gnu.org/onlinedocs/gcc-9.2.0/gfortran/SRAND.html) intrinsics in Flang, which are part of the GNU extension. These intrinsics are used in the following benchmark: [floatingspeed](https://github.com/ahbarnett/floatingspeed/)