Remove SVFInstruction to node maps in ICFG

[jumormt]

The ultimate goal is to remove these three maps in ICFG:

CSToCallNodeMapTy CSToCallNodeMap; ///< map a callsite to its CallICFGNode
CSToRetNodeMapTy CSToRetNodeMap; ///< map a callsite to its RetICFGNode
InstToBlockNodeMapTy InstToBlockNodeMap; ///< map a basic block to its ICFGNode

I want to migrate them to LLVMModuleset and build mapping from LLVM instruction directly to ICFGNodes. Currently these three maps are still in ICFG class but will be removed after all the migration is done.

[codecov]

Codecov Report

Attention: Patch coverage is 86.77419% with 41 lines in your changes missing coverage. Please review.

Project coverage is 62.88%. Comparing base (1f3c40d) to head (84bf1d2).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
svf-llvm/lib/SVFIRBuilder.cpp	79.03%	13 Missing ⚠️
svf/lib/DDA/ContextDDA.cpp	0.00%	8 Missing ⚠️
svf-llvm/include/SVF-LLVM/LLVMModule.h	77.77%	4 Missing ⚠️
svf-llvm/lib/LLVMModule.cpp	87.09%	4 Missing ⚠️
svf/lib/AE/Svfexe/AEDetector.cpp	0.00%	2 Missing ⚠️
svf/lib/Graphs/ICFG.cpp	75.00%	2 Missing ⚠️
svf/lib/SABER/SaberSVFGBuilder.cpp	0.00%	2 Missing ⚠️
svf-llvm/include/SVF-LLVM/DCHG.h	0.00%	1 Missing ⚠️
svf-llvm/lib/ICFGBuilder.cpp	98.68%	1 Missing ⚠️
svf/include/Graphs/CDG.h	0.00%	1 Missing ⚠️
... and 3 more

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1547      +/-   ##
==========================================
- Coverage   62.88%   62.88%   -0.01%     
==========================================
  Files         245      245              
  Lines       25687    25681       -6     
  Branches     4491     4505      +14     
==========================================
- Hits        16153    16149       -4     
+ Misses       9534     9532       -2     

Files with missing lines	Coverage Δ
svf-llvm/include/SVF-LLVM/ICFGBuilder.h	100.00% <100.00%> (ø)
svf-llvm/include/SVF-LLVM/LLVMUtil.h	82.35% <100.00%> (+1.10%)	⬆️
svf-llvm/include/SVF-LLVM/SVFIRBuilder.h	90.09% <100.00%> (+0.09%)	⬆️
svf-llvm/lib/LLVMLoopAnalysis.cpp	100.00% <100.00%> (ø)
svf-llvm/lib/LLVMUtil.cpp	79.11% <100.00%> (+0.51%)	⬆️
svf-llvm/lib/SVFIRExtAPI.cpp	84.74% <100.00%> (ø)
svf-llvm/lib/SymbolTableBuilder.cpp	89.09% <100.00%> (ø)
svf/include/Graphs/CFLGraph.h	92.00% <100.00%> (ø)
svf/include/Graphs/CHG.h	94.44% <100.00%> (ø)
svf/include/Graphs/CallGraph.h	92.15% <100.00%> (ø)
... and 36 more

... and 1 file with indirect coverage changes