Init spvgen before others
Init spvgen before others

Init spvgen before checking other things and potentially exiting.
spvgen is uninitialized unconditionally but it was previously only
initialized when e.g. the gfxip was valid. This lead to failing asserts
when the spvgen init/deinit did something like on Windows.

GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc