[turbofan] Factor out common switch-related code in instruction selectors.

src/compiler/instruction-selector.h

Index: src/compiler/instruction-selector.h
diff --git a/src/compiler/instruction-selector.h b/src/compiler/instruction-selector.h
index 937ed4db34f2497686e1f12ed1b50f255c85c108..fcf205a8d9f8530ce918211d8e1b5a22a5e2ce08 100644
--- a/src/compiler/instruction-selector.h
+++ b/src/compiler/instruction-selector.h
@@ -22,6 +22,7 @@ class BasicBlock;
 struct CallBuffer;  // TODO(bmeurer): Remove this.
 class FlagsContinuation;
 class Linkage;
+struct SwitchInfo;
 
 typedef ZoneVector<InstructionOperand> InstructionOperandVector;
 
@@ -134,6 +135,10 @@ class InstructionSelector FINAL {
  private:
   friend class OperandGenerator;
 
+  void EmitTableSwitch(const SwitchInfo& sw, InstructionOperand& index_operand);
+  void EmitLookupSwitch(const SwitchInfo& sw,
+                        InstructionOperand& value_operand);
+
   // Inform the instruction selection that {node} was just defined.
   void MarkAsDefined(Node* node);
 
@@ -201,9 +206,7 @@ class InstructionSelector FINAL {
   void VisitCall(Node* call, BasicBlock* handler);
   void VisitGoto(BasicBlock* target);
   void VisitBranch(Node* input, BasicBlock* tbranch, BasicBlock* fbranch);
-  void VisitSwitch(Node* node, BasicBlock* default_branch,
-                   BasicBlock** case_branches, int32_t* case_values,
-                   size_t case_count, int32_t min_value, int32_t max_value);
+  void VisitSwitch(Node* node, const SwitchInfo& sw);
   void VisitDeoptimize(Node* value);
   void VisitReturn(Node* value);
   void VisitThrow(Node* value);