refactor icfgbuilder and remove svfvirtualcallinst class

[jumormt]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.05%. Comparing base (5db169c) to head (a633cc8).
Report is 6 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1577      +/-   ##
==========================================
+ Coverage   62.86%   63.05%   +0.19%     
==========================================
  Files         244      244              
  Lines       25694    27270    +1576     
  Branches     4514     4518       +4     
==========================================
+ Hits        16152    17196    +1044     
- Misses       9542    10074     +532     

Files with missing lines	Coverage Δ
svf-llvm/include/SVF-LLVM/ICFGBuilder.h	100.00% <ø> (ø)
svf-llvm/include/SVF-LLVM/LLVMModule.h	95.38% <100.00%> (+1.26%)	⬆️
svf-llvm/include/SVF-LLVM/SVFIRBuilder.h	90.55% <ø> (+0.46%)	⬆️
svf-llvm/lib/ICFGBuilder.cpp	99.25% <100.00%> (+0.02%)	⬆️
svf-llvm/lib/LLVMModule.cpp	84.10% <100.00%> (+0.33%)	⬆️
svf-llvm/lib/SVFIRBuilder.cpp	84.04% <100.00%> (+0.05%)	⬆️
svf/include/SVFIR/SVFFileSystem.h	27.23% <ø> (-1.02%)	⬇️
svf/include/SVFIR/SVFValue.h	91.59% <ø> (+0.36%)	⬆️
svf/lib/SVFIR/SVFFileSystem.cpp	35.52% <ø> (-1.99%)	⬇️

... and 190 files with indirect coverage changes