[CONTRACTS] Support alias of member pointers in loop assigns inference

[qinheping]

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• Methods or procedures I have added are documented, following the guidelines provided in CODING_STANDARD.md.
• 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).
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[codecov]

Codecov Report

Attention: Patch coverage is 52.38095% with 20 lines in your changes missing coverage. Please review.

Project coverage is 78.87%. Comparing base (f2a7665) to head (98c2968).

Files with missing lines	Patch %	Lines
src/goto-instrument/loop_utils.cpp	52.38%	20 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8486      +/-   ##
===========================================
- Coverage    78.88%   78.87%   -0.01%     
===========================================
  Files         1727     1727              
  Lines       198333   198369      +36     
  Branches     18475    18479       +4     
===========================================
+ Hits        156453   156468      +15     
- Misses       41880    41901      +21     

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