Simplify typecast over ID_bv and pointers

[tautschnig]

This has the same semantics as ID_signedbv or ID_unsignedbv.

There is no hard dependency on #7343, but the code might not be exercised without those changes.

• 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

Base: 78.35% // Head: 78.36% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (f319e79) compared to base (25c32cc).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7344   +/-   ##
========================================
  Coverage    78.35%   78.36%           
========================================
  Files         1645     1645           
  Lines       190208   190250   +42     
========================================
+ Hits        149040   149083   +43     
+ Misses       41168    41167    -1     

Impacted Files	Coverage Δ
src/util/simplify_expr.cpp	85.31% <100.00%> (+0.01%)	⬆️
src/util/simplify_expr_int.cpp	87.69% <100.00%> (+0.53%)	⬆️
src/util/bitvector_expr.h	97.41% <0.00%> (+0.03%)	⬆️

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