Note: this was implemented and tested for ir3. The code paths that are
never used there [1] seem non-trivial to implement. Since they cannot be
easily tested, asserts and TODOs are added to ensure we don't
accidentally hit them for intrinsics with offset_shift.
[1]: these paths are never used on ir3 since lower_mem_access_bit_sizes
is only used for SSBO accesses to lower 64b accesses (which are 64b
aligned) to 32b ones. So we'll never request an increase of alignment.
Signed-off-by: Job Noorman <jnoorman@igalia.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35092>
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