[turbofan] Optimize certain chains of Branch into a Switch.

src/compiler/code-generator.h

Index: src/compiler/code-generator.h
diff --git a/src/compiler/code-generator.h b/src/compiler/code-generator.h
index 99397eae8e40e8aca2dc413e4b3f2a1501b26880..658394b3217ad79b00bfe632425f495dfd3f13e9 100644
--- a/src/compiler/code-generator.h
+++ b/src/compiler/code-generator.h
@@ -69,9 +69,10 @@ class CodeGenerator FINAL : public GapResolver::Assembler {
 
   void AssembleArchInstruction(Instruction* instr);
   void AssembleArchJump(BasicBlock::RpoNumber target);
-  void AssembleArchSwitch(Instruction* instr);
   void AssembleArchBranch(Instruction* instr, BranchInfo* branch);
   void AssembleArchBoolean(Instruction* instr, FlagsCondition condition);
+  void AssembleArchLookupSwitch(Instruction* instr);
+  void AssembleArchTableSwitch(Instruction* instr);
 
   void AssembleDeoptimizerCall(int deoptimization_id);