nir: Collect if shader uses cross-invocation or indirect I/O.

nir: Collect if shader uses cross-invocation or indirect I/O.

The following new fields are added to tess shader info:

* `tcs_cross_invocation_inputs_read`
* `tcs_cross_invocation_outputs_read`

These are I/O masks that are a subset of inputs_read and outputs_read
and they contain which per-vertex inputs and outputs are read
cross-invocation.

Additionall, the following new fields are added to shader_info:

* `inputs_read_indirectly`
* `outputs_accessed_indirectly`
* `patch_inputs_read_indirectly`
* `patch_outputs_accessed_indirectly`

These new fields can be used for optimizing TCS in a back-end compiler.
If you can be sure that the TCS doesn't use cross-invocation inputs
or outputs, you can choose a different strategy for storing VS and TCS
outputs. However, such optimizations might need to be disabled when
the inputs/outputs are accessed indirectly due to backend limitations,
so this information is also collected.

Example: RADV currently has to store all VS and TCS outputs in LDS, but
for shaders when only inputs and/or outputs belonging to the current
invocation ID are used, it could skip storing these in LDS entirely.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4165>