[clang][dataflow] Eliminate deprecated `ControlFlowContext::build()` overload.

[mboehme]

Failing pre-merge checks look unrelated

clang/include/clang/Analysis/FlowSensitive/ControlFlowContext.h

public:
   /// `Func.hasBody()` must be true, and `Func.isTemplated()` must be false.
   static llvm::Expected<ControlFlowContext> build(const FunctionDecl &Func);
 
   /// Builds a ControlFlowContext from an AST node. `D` is the function in which
   /// `S` resides. `D.isTemplated()` must be false.
   static llvm::Expected<ControlFlowContext> build(const Decl &D, Stmt &S,
                                                   ASTContext &C);
 
-  /// Builds a ControlFlowContext from an AST node. `D` is the function in which
-  /// `S` resides. `D` must not be null and `D->isTemplated()` must be false.
-  LLVM_DEPRECATED("Use the version that takes a const Decl & instead", "")
-  static llvm::Expected<ControlFlowContext> build(const Decl *D, Stmt &S,
-                                                  ASTContext &C);
-
   /// Returns the `Decl` containing the statement used to construct the CFG, if
   /// available.
   const Decl &getDecl() const { return ContainingDecl; }
 
   /// Returns the CFG that is stored in this context.
   const CFG &getCFG() const { return *Cfg; }
 
   /// Returns a mapping from statements to basic blocks that contain them.

clang/lib/Analysis/FlowSensitive/ControlFlowContext.cpp

llvm::DenseMap<const Stmt *, const CFGBlock *> StmtToBlock =
       buildStmtToBasicBlockMap(*Cfg);
 
   llvm::BitVector BlockReachable = findReachableBlocks(*Cfg);
 
   return ControlFlowContext(D, std::move(Cfg), std::move(StmtToBlock),
                             std::move(BlockReachable));
 }
 
-llvm::Expected<ControlFlowContext>
-ControlFlowContext::build(const Decl *D, Stmt &S, ASTContext &C) {
-  if (D == nullptr)
-    return llvm::createStringError(
-        std::make_error_code(std::errc::invalid_argument),
-        "Declaration must not be null");
-
-  return build(*D, S, C);
-}
-
 } // namespace dataflow
 } // namespace clang