Revert "[turbofan] Polymorphic inlining - try merge map check dispatch with...

Revert "[turbofan] Polymorphic inlining - try merge map check dispatch with function call dispatch."

This reverts commit 627c440b.

Reason for revert: Likely breaks Canary.

Original change's description:
> [turbofan] Polymorphic inlining - try merge map check dispatch with function call dispatch.
> 
> This improves delta blue by about >5%. Unfortunately, this still does not help load
> and check elimination because we do not learn maps from control flow.
> 
> Change-Id: I49a97dbc40576b9bc80c87ec2b459e37ba9b4440
> Bug: v8:5267
> Reviewed-on: https://chromium-review.googlesource.com/618328
> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org>
> Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#47405}

TBR=jarin@chromium.org,bmeurer@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: v8:5267
Change-Id: Id12519ae98b42b57fbef86d0685950f6c85f5082
Reviewed-on: https://chromium-review.googlesource.com/622827Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47457}

src/compiler/js-inlining-heuristic.h

@@ -64,17 +64,6 @@ class JSInliningHeuristic final : public AdvancedReducer {
   // Dumps candidates to console.
   void PrintCandidates();
   Reduction InlineCandidate(Candidate const& candidate, bool force_inline);
-  void CreateOrReuseDispatch(Node* node, Node* callee,
-                             Candidate const& candidate, Node** if_successes,
-                             Node** calls, Node** inputs, int input_count);
-  bool TryReuseDispatch(Node* node, Node* callee, Candidate const& candidate,
-                        Node** if_successes, Node** calls, Node** inputs,
-                        int input_count);
-  enum StateCloneMode { kCloneState, kChangeInPlace };
-  Node* DuplicateFrameStateAndRename(Node* frame_state, Node* from, Node* to,
-                                     StateCloneMode mode);
-  Node* DuplicateStateValuesAndRename(Node* state_values, Node* from, Node* to,
-                                      StateCloneMode mode);
 
   CommonOperatorBuilder* common() const;
   Graph* graph() const;