simplify_inequality_address_of only supports (not)equal

[tautschnig]

Invoking it for arbitrary binary comparisons resulted in an invariant
failure.

• Each commit message has a non-empty body, explaining why the change was made.
• n/a Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• n/a The feature or user visible behaviour I have added or modified has been documented in the User Guide in doc/cprover-manual/
• Regression or unit tests are included, or existing tests cover the modified code (in this case I have detailed which ones those are in the commit message).
• n/a My commit message includes data points confirming performance improvements (if claimed).
• My PR is restricted to a single feature or bugfix.
• n/a White-space or formatting changes outside the feature-related changed lines are in commits of their own.

[codecov]

Codecov Report

Merging #6142 (b1fcc9a) into develop (918e17c) will decrease coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #6142      +/-   ##
===========================================
- Coverage    74.98%   74.95%   -0.04%     
===========================================
  Files         1447     1447              
  Lines       158212   158208       -4     
===========================================
- Hits        118633   118577      -56     
- Misses       39579    39631      +52     

Impacted Files	Coverage Δ
src/solvers/flattening/bv_pointers.cpp	81.15% <100.00%> (-0.24%)	⬇️
src/solvers/flattening/bv_pointers.h	100.00% <100.00%> (ø)
src/util/simplify_expr_int.cpp	82.30% <100.00%> (-1.71%)	⬇️
src/goto-programs/link_goto_model.cpp	0.00% <0.00%> (-77.97%)	⬇️
src/goto-programs/goto_program.cpp	53.05% <0.00%> (-13.62%)	⬇️
src/util/simplify_expr_pointer.cpp	80.99% <0.00%> (-4.68%)	⬇️
src/util/find_symbols.cpp	82.22% <0.00%> (-3.34%)	⬇️
src/util/json_irep.cpp	92.85% <0.00%> (-1.79%)	⬇️
... and 7 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 53564c1...b1fcc9a. Read the comment docs.