gpu-compute: Fatal on dynamic scratch allocation in GPUFS
gpu-compute: Fatal on dynamic scratch allocation in GPUFS

This is known not working in GPUFS. As a result, the simulation will
never end. Rather than simulate forever, add a fatal for now to exit
simulation until support for this functionality is added.

Change-Id: I8e45996a7eb781575e8643baea05daf87bc5f1c3
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/58472
Reviewed-by: Jason Lowe-Power <92de577f37050ad05b60626d2f17913f40dcb1a2@gmail.com>
Reviewed-by: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Maintainer: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5,gem5/gem5