consts
VK_SHADER_INDEX_UNUSED_AMDX
Sentinel for an unused shader index
VK_SHADER_INDEX_UNUSED_AMDX
is a special shader index used to indicate
that the created node does not override the index.
In this case, the shader index is determined through other means.
It is defined as:
#define VK_SHADER_INDEX_UNUSED_AMDX (~0U)