Revert "[clang][dataflow] Add an early-out to flowConditionImplies() / flowConditionAllows(). (#77453)"

This reverts commit 03a0bfa.

Author: martinboehme

clang/include/clang/Analysis/FlowSensitive/Formula.h

@@ -75,10 +75,6 @@ class alignas(const Formula *) Formula {
     return static_cast<bool>(Value);
   }
 
-  bool isLiteral(bool b) const {
-    return kind() == Literal && static_cast<bool>(Value) == b;
-  }
-
   ArrayRef<const Formula *> operands() const {
     return ArrayRef(reinterpret_cast<Formula *const *>(this + 1),
                     numOperands(kind()));

clang/lib/Analysis/FlowSensitive/DataflowAnalysisContext.cpp

@@ -174,9 +174,6 @@ Solver::Result DataflowAnalysisContext::querySolver(
 
 bool DataflowAnalysisContext::flowConditionImplies(Atom Token,
                                                    const Formula &F) {
-  if (F.isLiteral(true))
-    return true;
-
   // Returns true if and only if truth assignment of the flow condition implies
   // that `F` is also true. We prove whether or not this property holds by
   // reducing the problem to satisfiability checking. In other words, we attempt
@@ -191,9 +188,6 @@ bool DataflowAnalysisContext::flowConditionImplies(Atom Token,
 
 bool DataflowAnalysisContext::flowConditionAllows(Atom Token,
                                                   const Formula &F) {
-  if (F.isLiteral(true))
-    return true;
-
   llvm::SetVector<const Formula *> Constraints;
   Constraints.insert(&arena().makeAtomRef(Token));
   Constraints.insert(&F);