Call NodeIDAllocator::unset() when llvmModuleSet released.

[vonavi]

Hello!

Usually, one finishes an analysis calling releaseLLVMModuleSet(). After that, singleton NodeIDAllocator is still alive, so that next time we start with non-empty NodeIDAllocator and empty llvmModuleSet. So, this PR empties NodeIDAllocator too.

Best regards,
Vladimir.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 64.46%. Comparing base (4cc6c25) to head (0365258).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1837      +/-   ##
==========================================
+ Coverage   64.45%   64.46%   +0.01%     
==========================================
  Files         252      252              
  Lines       25210    25211       +1     
  Branches     4768     4768              
==========================================
+ Hits        16248    16253       +5     
+ Misses       8962     8958       -4     

Files with missing lines	Coverage Δ
svf-llvm/include/SVF-LLVM/LLVMModule.h	97.61% <100.00%> (+0.02%)	⬆️

... and 1 file with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.