Contracts/dynamic frames: do not attempt to instrument typedefs

[tautschnig]

When collecting all functions from the symbol table (code-typed symbols), we must not include typedefs (which may also be code typed).

• 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

All modified and coverable lines are covered by tests ✅

Project coverage is 78.02%. Comparing base (b335979) to head (6a37de3).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #8403   +/-   ##
========================================
  Coverage    78.02%   78.02%           
========================================
  Files         1726     1726           
  Lines       189442   189442           
  Branches     18466    18466           
========================================
  Hits        147808   147808           
  Misses       41634    41634           

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