Build CFBasicBlockG based on SVFBasicBlocks rather than ICFG

[jumormt]

• Previously we built CFBasicBlockG based on ICFG which is not intuitive because each CFBasicBlockGNode is related to SVFBasicBlock.
• Remove intrinsic instructions in BB node. The intrinsic instructions are redundant.

[codecov]

Codecov Report

Merging #1275 (e972fd9) into master (9831850) will not change coverage.
Report is 1 commits behind head on master.
The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1275   +/-   ##
=======================================
  Coverage   64.49%   64.49%           
=======================================
  Files         223      223           
  Lines       23802    23802           
=======================================
  Hits        15351    15351           
  Misses       8451     8451           

Files	Coverage Δ
svf-llvm/lib/LLVMModule.cpp	82.77% <ø> (ø)