move libSvfCore and libSvfLLVM files to lib folder

[bjjwwang]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (6ac31f6) 67.87% compared to head (478b0d0) 67.87%.
Report is 13 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1366   +/-   ##
=======================================
  Coverage   67.87%   67.87%           
=======================================
  Files         253      253           
  Lines       27703    27702    -1     
=======================================
  Hits        18804    18804           
+ Misses       8899     8898    -1     

Files	Coverage Δ
svf-llvm/tools/AE/ae.cpp	100.00% <ø> (ø)
svf/include/AE/Svfexe/AbstractExecution.h	100.00% <ø> (ø)
svf/include/AE/Svfexe/BufOverflowChecker.h	100.00% <100.00%> (ø)
svf/include/AE/Svfexe/SVFIR2ItvExeState.h	100.00% <ø> (ø)
svf/lib/Util/ExtAPI.cpp	67.10% <100.00%> (ø)

... and 2 files with indirect coverage changes