transformations: (csl-stencil-bufferize) AccessOp to read to_tensor's underlying memref

[n-io]

csl_stencil.AccessOps can read directly from memrefs underlying any bufferization.to_tensor passed into them.

Currently, in the presence of several buffers (ie, stencil fields translated to memrefs at this stage), all but the main buffer will have intermediate bufferization.to_tensor ops, which creates problems in lowering. The AccessOps can instead work directly off of the underlying memrefs.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.29%. Comparing base (753ae32) to head (8e911b4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3663   +/-   ##
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  Coverage   91.29%   91.29%           
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  Files         466      466           
  Lines       58310    58311    +1     
  Branches     5634     5634           
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+ Hits        53232    53235    +3     
+ Misses       3629     3628    -1     
+ Partials     1449     1448    -1     

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[dk949]

Looks good