goto_rw: left shift may be larger than object size

[tautschnig]

While such an expression might have undefined behaviour in some source
languages, goto_rw should not assert that a goto program does not
contain such an expression.

• 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 #6723 (542ce54) into develop (c0f179c) will increase coverage by 0.02%.
The diff coverage is 86.99%.

@@             Coverage Diff             @@
##           develop    #6723      +/-   ##
===========================================
+ Coverage    76.87%   76.89%   +0.02%     
===========================================
  Files         1590     1590              
  Lines       183887   183977      +90     
===========================================
+ Hits        141364   141478     +114     
+ Misses       42523    42499      -24     

Impacted Files	Coverage Δ
src/ansi-c/goto_check_c.cpp	91.47% <ø> (-0.15%)	⬇️
...c/solvers/smt2_incremental/convert_expr_to_smt.cpp	72.09% <79.48%> (+3.07%)	⬆️
src/analyses/goto_rw.cpp	63.28% <100.00%> (+0.93%)	⬆️
src/goto-programs/builtin_functions.cpp	58.35% <100.00%> (+1.48%)	⬆️
src/util/pointer_expr.h	80.68% <100.00%> (ø)
src/util/simplify_expr_int.cpp	85.59% <100.00%> (ø)
src/util/std_expr.h	93.66% <0.00%> (+0.18%)	⬆️
src/util/bitvector_expr.h	97.28% <0.00%> (+0.54%)	⬆️
... and 3 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 629d029...542ce54. Read the comment docs.