Replace DFCC's set_hide by call to make_hidden

[tautschnig]

We don't need to mark each instruction as hidden for goto-symex will pick up the is-hidden marker from the goto_functiont containing the instruction(s).

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• 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

Patch coverage: 100.00% and project coverage change: -0.02 ⚠️

Comparison is base (f39a5c1) 78.52% compared to head (492b06f) 78.50%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7681      +/-   ##
===========================================
- Coverage    78.52%   78.50%   -0.02%     
===========================================
  Files         1674     1674              
  Lines       191971   191961      -10     
===========================================
- Hits        150738   150708      -30     
- Misses       41233    41253      +20     

Impacted Files	Coverage Δ
...instrument/contracts/dynamic-frames/dfcc_utils.cpp	86.78% <ø> (-0.28%)	⬇️
...o-instrument/contracts/dynamic-frames/dfcc_utils.h	0.00% <ø> (ø)
...strument/contracts/dynamic-frames/dfcc_library.cpp	93.64% <100.00%> (-0.08%)	⬇️
...t/contracts/dynamic-frames/dfcc_spec_functions.cpp	91.81% <100.00%> (ø)
...nt/contracts/dynamic-frames/dfcc_swap_and_wrap.cpp	86.36% <100.00%> (ø)

... and 1 file with indirect coverage changes

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