uninitialized check

[kroening]

Uninitialized local or dynamically allocated variables have an indeterminate initial value.

Reading an indeterminate value may be undefined behavior, or may yield an unspecific value.

This adds a check for uninitialized local variables. The check is not added as a standard check.

• Each commit message has a non-empty body, explaining why the change was made.
• 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).
• 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

Attention: Patch coverage is 38.70968% with 19 lines in your changes missing coverage. Please review.

Project coverage is 78.27%. Comparing base (f9a7807) to head (a8069ba).

Files with missing lines	Patch %	Lines
src/ansi-c/goto-conversion/goto_check_c.cpp	38.70%	19 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #8545      +/-   ##
===========================================
- Coverage    78.38%   78.27%   -0.12%     
===========================================
  Files         1729     1729              
  Lines       200151   200453     +302     
  Branches     18244    18316      +72     
===========================================
+ Hits        156883   156895      +12     
- Misses       43268    43558     +290     

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