X64: Add a jumptable to for deoptimization checks on X64....

src/x64/lithium-codegen-x64.h

Index: src/x64/lithium-codegen-x64.h
===================================================================
--- src/x64/lithium-codegen-x64.h	(revision 6957)
+++ src/x64/lithium-codegen-x64.h	(working copy)
@@ -53,6 +53,7 @@
         current_instruction_(-1),
         instructions_(chunk->instructions()),
         deoptimizations_(4),
+        jump_table_(4),
         deoptimization_literals_(8),
         inlined_function_count_(0),
         scope_(chunk->graph()->info()->scope()),
@@ -147,6 +148,7 @@
   bool GeneratePrologue();
   bool GenerateBody();
   bool GenerateDeferredCode();
+  bool GenerateJumpTable();
   bool GenerateSafepointTable();
 
   void CallCode(Handle<Code> code,
@@ -234,6 +236,14 @@
   // Emits code for pushing a constant operand.
   void EmitPushConstantOperand(LOperand* operand);
 
+  struct JumpTableEntry {
+    inline JumpTableEntry(Address address)
+        : label_(),
+          address_(address) { }
+    Label label_;
+    Address address_;
+  };
+
   LChunk* const chunk_;
   MacroAssembler* const masm_;
   CompilationInfo* const info_;
@@ -242,6 +252,7 @@
   int current_instruction_;
   const ZoneList<LInstruction*>* instructions_;
   ZoneList<LEnvironment*> deoptimizations_;
+  ZoneList<JumpTableEntry*> jump_table_;
   ZoneList<Handle<Object> > deoptimization_literals_;
   int inlined_function_count_;
   Scope* const scope_;