[clang][dataflow] Remove deprecated pass-through APIs for DataflowAnalysisContext.

[bazuzi]

Summary

These were recently deprecated in https://reviews.llvm.org/D149464.

clang/include/clang/Analysis/FlowSensitive/DataflowEnvironment.h

public:
   ///
   /// If `DeclCtx` is a function, initializes the environment with symbolic
   /// representations of the function parameters.
   ///
   /// If `DeclCtx` is a non-static member function, initializes the environment
   /// with a symbolic representation of the `this` pointee.
   Environment(DataflowAnalysisContext &DACtx, const DeclContext &DeclCtx);
 
-  LLVM_DEPRECATED("Use getDataflowAnalysisContext().getOptions() instead.", "")
-  const DataflowAnalysisContext::Options &getAnalysisOptions() const {
-    return DACtx->getOptions();
-  }
-
-  LLVM_DEPRECATED("Use getDataflowAnalysisContext().arena() instead.", "")
-  Arena &arena() const { return DACtx->arena(); }
-
-  LLVM_DEPRECATED("Use getDataflowAnalysisContext().getOptions().Log instead.",
-                  "")
-  Logger &logger() const { return *DACtx->getOptions().Log; }
-
   /// Creates and returns an environment to use for an inline analysis  of the
   /// callee. Uses the storage location from each argument in the `Call` as the
   /// storage location for the corresponding parameter in the callee.
   ///
   /// Requirements:
   ///
   ///  The callee of `Call` must be a `FunctionDecl`.
   ///
public:
   /// returns null.
   const DeclContext *getDeclCtx() const { return CallStack.back(); }
 
   /// Returns whether this `Environment` can be extended to analyze the given
   /// `Callee` (i.e. if `pushCall` can be used), with recursion disallowed and a
   /// given `MaxDepth`.
   bool canDescend(unsigned MaxDepth, const DeclContext *Callee) const;
 
-  /// Returns the `ControlFlowContext` registered for `F`, if any. Otherwise,
-  /// returns null.
-  LLVM_DEPRECATED(
-      "Use getDataflowAnalysisContext().getControlFlowContext(F) instead.", "")
-  const ControlFlowContext *getControlFlowContext(const FunctionDecl *F) {
-    return DACtx->getControlFlowContext(F);
-  }
-
   /// Returns the `DataflowAnalysisContext` used by the environment.
   DataflowAnalysisContext &getDataflowAnalysisContext() const { return *DACtx; }
 
   LLVM_DUMP_METHOD void dump() const;
   LLVM_DUMP_METHOD void dump(raw_ostream &OS) const;
 
 private:
   /// Creates a value appropriate for `Type`, if `Type` is supported, otherwise