Alyssa Rosenzweig ae3af4c73a nir: document restriction on load_smem_amd constantness
This came up while reviewing
https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29398 ... Possibly
this intrinsic should be renamed to load_smem_constant_amd for consistency with
load_global_constant. But if we're not going to convey constantness in the
intrinsic name, let's at least document the restriction, because NIR's optimizer
relies on it.

(I didn't inspect every call site, but it looks like load_smem_amd is just used
for descriptor loads so there's no bug to fix.)

Signed-off-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/29743>
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`Mesa <https://mesa3d.org>`_ - The 3D Graphics Library
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