perf: skip SSA analysis if no analyzers are loaded

[ian-oneleet]

When no Analyzer-based rules are loaded, skip the SSA analysis. This provides a huge performance improvement on a large proprietary codebase, from ~6 minutes to under 30s.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.43%. Comparing base (1216c9b) to head (7e276d3).
⚠️ Report is 130 commits behind head on master.
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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1419      +/-   ##
==========================================
- Coverage   68.49%   64.43%   -4.07%     
==========================================
  Files          75       76       +1     
  Lines        4384     4592     +208     
==========================================
- Hits         3003     2959      -44     
- Misses       1233     1498     +265     
+ Partials      148      135      -13     

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