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

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

This reverts commit 4cee9fbc.

Reason for revert: Breaks on clusterfuzz.

Original change's description:
> Reland "[turbofan] Polymorphic inlining - try merge map check dispatch with function call dispatch."
> 
> This reverts commit 57af6811.
> 
> This adds the checkpoint between the call and the polymorphic load.
> I thought that JSCall with constant target cannot cause eager deopt,
> but Canary seems to disagree (http://crbug.com/718019).
> 
> Bug: v8:5267,chromium:718019
> Change-Id: I552b850db6beb93e733b371ad0e7204513da1dc4
> Reviewed-on: https://chromium-review.googlesource.com/622867
> Reviewed-by: Tobias Tebbi <tebbi@chromium.org>
> Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#47521}

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

Change-Id: Ib333883fa27b79fcd766c33997cb0ce46547bb94
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: v8:5267, chromium:718019
Reviewed-on: https://chromium-review.googlesource.com/628076Reviewed-by: Jaroslav Sevcik <jarin@chromium.org>
Commit-Queue: Jaroslav Sevcik <jarin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47539}

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;