Implement on the fly update of call graph respecting forksite

[JoelYYoung]

1. Update call graph on the fly respecting forksite while performing pointer analysis
2. Fix pushIntoWorklist and popOutWorklist function of steensgaard

[codecov]

Codecov Report

Attention: Patch coverage is 61.42857% with 27 lines in your changes missing coverage. Please review.

Please upload report for BASE (master@fc185be). Learn more about missing BASE report.
Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
svf/lib/WPA/Steensgaard.cpp	0.00%	20 Missing ⚠️
svf/include/WPA/Steensgaard.h	0.00%	7 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #1550   +/-   ##
=========================================
  Coverage          ?   62.69%           
=========================================
  Files             ?      245           
  Lines             ?    25736           
  Branches          ?     4509           
=========================================
  Hits              ?    16134           
  Misses            ?     9602           
  Partials          ?        0           

Files with missing lines	Coverage Δ
svf/include/Graphs/ThreadCallGraph.h	52.94% <100.00%> (ø)
svf/include/MTA/TCT.h	86.91% <ø> (ø)
svf/include/MemoryModel/PointerAnalysis.h	78.43% <ø> (ø)
svf/include/MemoryModel/PointerAnalysisImpl.h	58.99% <ø> (ø)
svf/include/WPA/Andersen.h	89.28% <ø> (ø)
svf/include/WPA/WPASolver.h	72.97% <100.00%> (ø)
svf/lib/Graphs/ThreadCallGraph.cpp	66.66% <ø> (ø)
svf/lib/MemoryModel/PointerAnalysisImpl.cpp	79.43% <100.00%> (ø)
svf/lib/WPA/Andersen.cpp	93.85% <100.00%> (ø)
svf/include/WPA/Steensgaard.h	0.00% <0.00%> (ø)
... and 1 more