CONTRACTS: Remove helper method check_for_looped_mallocs

[feliperodri]

We now inline functions with contracts during instrumentation,
so this method is no longer used.

Resolves #5530

Signed-off-by: Felipe R. Monteiro [email protected]

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[codecov]

Codecov Report

Merging #6729 (56f317a) into develop (9053c5f) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop    #6729      +/-   ##
===========================================
+ Coverage    76.85%   76.86%   +0.01%     
===========================================
  Files         1589     1589              
  Lines       183846   183813      -33     
===========================================
  Hits        141289   141289              
+ Misses       42557    42524      -33     

Impacted Files	Coverage Δ
src/goto-instrument/contracts/contracts.cpp	92.56% <ø> (+4.24%)	⬆️
src/goto-instrument/contracts/contracts.h	100.00% <ø> (ø)

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