dialects (llvm): Add dense array constraint for the position attribute of llvm.extractvalue and llvm.insertvalue operations

[compor]

This PR:

• Adds a dense array constraint for the position attribute of llvm.extractvalue and llvm.insertvalue operations, restricting to i64 as in MLIR.
• Filecheck tests of the above

Resolves #3155

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.75%. Comparing base (7c4cb63) to head (d79f192).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3643      +/-   ##
==========================================
+ Coverage   90.73%   90.75%   +0.01%     
==========================================
  Files         465      467       +2     
  Lines       58780    58907     +127     
  Branches     5635     5639       +4     
==========================================
+ Hits        53336    53463     +127     
- Misses       4000     4001       +1     
+ Partials     1444     1443       -1     

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