Add Vega new intrinsics..

[oscarbg]

Hi,
seeing Vega slide deck I see Vega NCU adds 40 new instructions..
are you planning to exposing some of it via AGS?
for example XAD_u32 and sat_pk_u8_i16 seem nice..

just a question also Vega supports 64 bit global float (double) precision atomics like Pascal exposes via GL_NV_shader_atomic_float64?
if yes you should expose jointly with 64 int global atomics in Vulkan, and OGL also..