Add regression test for object accessed through integer pointer

[danpoe]

This is probably a known issue.

@kroening @tautschnig @peterschrammel Do we have a test for that already?

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• 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).
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[danpoe]

Issue to track this: #5327

[hannes-steffenhagen-diffblue]

the way we do memory handling is weird.

[codecov]

Codecov Report

Merging #5326 (36c2838) into develop (b4d939b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop    #5326   +/-   ##
========================================
  Coverage    68.53%   68.53%           
========================================
  Files         1187     1187           
  Lines        98268    98268           
========================================
  Hits         67345    67345           
  Misses       30923    30923           

Flag	Coverage Δ
cproversmt2	43.08% <ø> (ø)
regression	65.70% <ø> (ø)
unit	32.26% <ø> (ø)

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