fix: prevent abort when Value is ConstantData

[Khosro-Moeini]

As per llvm/llvm-project@9383fb2, LLVM 21 no longer permits the inspection of users of ConstantData. I encountered two crashes due to this change.

I added checks to guard the two calls that caused the crashes.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.45%. Comparing base (5c45081) to head (e83f846).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1830   +/-   ##
=======================================
  Coverage   64.44%   64.45%           
=======================================
  Files         252      252           
  Lines       25208    25210    +2     
  Branches     4768     4768           
=======================================
+ Hits        16246    16248    +2     
  Misses       8962     8962           

Files with missing lines	Coverage Δ
svf-llvm/lib/ObjTypeInference.cpp	95.10% <100.00%> (+0.03%)	⬆️

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[yuleisui]

Thanks for the fix. It would be good to check any other places of the uses of constantdata.