[WIP]add AbstractValue

[bjjwwang]

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[codecov]

Codecov Report

Attention: Patch coverage is 73.78190% with 226 lines in your changes are missing coverage. Please review.

Project coverage is 68.19%. Comparing base (cc81fe9) to head (5609cc1).
Report is 3 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1423      +/-   ##
==========================================
+ Coverage   68.05%   68.19%   +0.14%     
==========================================
  Files         250      248       -2     
  Lines       27781    27796      +15     
==========================================
+ Hits        18905    18956      +51     
+ Misses       8876     8840      -36     

Files	Coverage Δ
svf-llvm/tools/AE/ae.cpp	100.00% <100.00%> (ø)
svf/include/AE/Core/AddressValue.h	68.00% <100.00%> (-19.10%)	⬇️
svf/include/AE/Core/IntervalValue.h	75.62% <100.00%> (-0.53%)	⬇️
svf/include/AE/Core/RelationSolver.h	100.00% <ø> (ø)
svf/include/AE/Svfexe/AbstractInterpretation.h	100.00% <100.00%> (ø)
svf/include/AE/Svfexe/BufOverflowChecker.h	100.00% <100.00%> (ø)
svf/include/AE/Svfexe/SVFIR2ItvExeState.h	100.00% <100.00%> (ø)
svf/lib/AE/Core/RelationSolver.cpp	88.10% <82.60%> (-0.19%)	⬇️
svf/lib/AE/Svfexe/AbstractInterpretation.cpp	86.43% <89.06%> (ø)
svf/include/AE/Core/AbstractValue.h	88.11% <88.11%> (-11.89%)	⬇️
... and 4 more

... and 3 files with indirect coverage changes