CONTRACTS: loop info tagging utility functions

[remi-delmas-3000]

Co-authored with @qinheping

Utility functions for loop contracts instrumentation, allowing to tag GOTO instructions with loop identifiers and loop instruction type.

Extracted from #7541, can only be tested once all features are in place.

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[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.27 🎉

Comparison is base (47e6e92) 78.24% compared to head (45f155c) 78.51%.

❗ Current head 45f155c differs from pull request most recent head 797062a. Consider uploading reports for the commit 797062a to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7632      +/-   ##
===========================================
+ Coverage    78.24%   78.51%   +0.27%     
===========================================
  Files         1674     1674              
  Lines       191935   191956      +21     
===========================================
+ Hits        150176   150723     +547     
+ Misses       41759    41233     -526     

see 36 files with indirect coverage changes

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[qinheping]

LGTM