Add profiling hooks

[imrn99]

Description

Scope: benches

Type of change: feat

Content description:

• add a profiling feature
• add profiling macros that generate code if the profiling feature is enabled
  • macros write to a fifo at /tmp/hc_perf_control to enable & disable perf sampling
  • the section profiled is controlled using environment variables (e.g. HCBENCH_REMESH_SWAP for the swap step of the remesh kernel)
  • prof_init, prof_start, prof_stop; init is required due to conditions on static mutable refs

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.62%. Comparing base (36b8972) to head (e3ecc61).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #336   +/-   ##
=======================================
  Coverage   87.62%   87.62%           
=======================================
  Files          72       72           
  Lines       11370    11370           
=======================================
  Hits         9963     9963           
  Misses       1407     1407           

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