[PATCH] D128521: [clang][dataflow] Implement functionality to compare if two boolean values are equivalent.

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`equivBoolVals` compares equivalence between two booleans. The current implementation does not consider constraints imposed by flow conditions on the booleans and its subvalues.

Depends On D128520 <https://reviews.llvm.org/D128520>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128521

Files:
  clang/include/clang/Analysis/FlowSensitive/DataflowAnalysisContext.h
  clang/lib/Analysis/FlowSensitive/DataflowAnalysisContext.cpp
  clang/unittests/Analysis/FlowSensitive/DataflowAnalysisContextTest.cpp

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