I am confirming this affects me as well, installing the kernel from
stretch-backports, using an AMD RX 580.

The workaround is to clone https://git.kernel.org/pub/scm/linux/kernel/
git/firmware/linux-firmware.git/, and copy the missing files to their
proper place using rsync -a -v --ignore-existing source
/lib/firmware/amdgpu/. After that, the system boots fine.

I am hoping the appropriate firmware files will be added soon in

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