Fixes for address expressions

[kroening]

This is a collection of fixes for the address constructor expressions.

• 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).
• 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.

[tautschnig]

We have that situation in quite a few of the constructors, and don't usually include such a comment. So I'm wondering whether it might just unnecessarily alert people?

[codecov]

Codecov Report

Merging #6715 (06075c0) into develop (ee16d80) will increase coverage by 0.00%.
The diff coverage is 39.53%.

@@           Coverage Diff            @@
##           develop    #6715   +/-   ##
========================================
  Coverage    76.80%   76.80%           
========================================
  Files         1589     1589           
  Lines       183658   183676   +18     
========================================
+ Hits        141056   141071   +15     
- Misses       42602    42605    +3     

Impacted Files	Coverage Δ
src/analyses/reaching_definitions.cpp	77.51% <ø> (ø)
src/solvers/flattening/bv_pointers.cpp	83.02% <0.00%> (-0.41%)	⬇️
src/util/pointer_expr.cpp	72.72% <0.00%> (+0.72%)	⬆️
src/util/pointer_expr.h	79.82% <0.00%> (-0.70%)	⬇️
src/analyses/dependence_graph.cpp	90.36% <100.00%> (+0.68%)	⬆️
src/analyses/dependence_graph.h	85.13% <100.00%> (+1.31%)	⬆️

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