spirv: add support for doubles to OpSpecConstant

v2 (Jason):
- Fix indent in radv change
- Add vtn_u64_literal() helper to take 64 bits (Jason)

Signed-off-by: Samuel Iglesias Gonsálvez <siglesias@igalia.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/vulkan/anv_pipeline.c

@@ -117,7 +117,10 @@ anv_shader_compile_to_nir(struct anv_device *device,
          assert(data + entry.size <= spec_info->pData + spec_info->dataSize);
 
          spec_entries[i].id = spec_info->pMapEntries[i].constantID;
-         spec_entries[i].data = *(const uint32_t *)data;
+         if (spec_info->dataSize == 8)
+            spec_entries[i].data64 = *(const uint64_t *)data;
+         else
+            spec_entries[i].data32 = *(const uint32_t *)data;
       }
    }