[PATCH] D128363: [clang][dataflow] Implement functionality for flow condition variable substitution.

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This patch introduces `buildAndSubstituteFlowCondition` - given a flow condition token, this function returns the expression of constraints defining the flow condition, with values substituted where specified.

As an example:\
Say we have tokens `FC1`, `FC2`, `FC3`:

  FlowConditionConstraints: {
   FC1: C1,
   FC2: C2,
   FC3: (FC1 v FC2) ^ C3,
  }

`buildAndSubstituteFlowCondition(FC3, /*Substitutions:*/{{C1 -> C1'}})`
returns a value corresponding to `(C1' v C2) ^ C3`.

Note:
This function returns the flow condition expressed directly as its constraints, which differs to how we currently represent the flow condition as a token bound to a set of constraints and dependencies. Making the representation consistent may be an option to consider in the future.

Depends On D128357 <https://reviews.llvm.org/D128357>


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D128363

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

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