Update the number of available SGPRs (#1970)
Update the number of available SGPRs (#1970)

Update the number of available general purpose SGPRs to 102 on GFX8+ and
then to 106 on GFX10+. I think this does not affect codegen but it makes
it less confusing for humans reading the PAL metadata.
GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc,GPUOpen-Drivers/llpc