Add mips64 port.

src/full-codegen.h

Index: src/full-codegen.h
diff --git a/src/full-codegen.h b/src/full-codegen.h
index 8f64340f2eb81092fb8f5124cb39afe5428472db..555bc601cabfbaa5219c661cda8f2f27e5332785 100644
--- a/src/full-codegen.h
+++ b/src/full-codegen.h
@@ -115,6 +115,9 @@ class FullCodeGenerator: public AstVisitor {
 #elif V8_TARGET_ARCH_MIPS
   static const int kCodeSizeMultiplier = 149;
   static const int kBootCodeSizeMultiplier = 120;
+#elif V8_TARGET_ARCH_MIPS64
+  static const int kCodeSizeMultiplier = 149;
+  static const int kBootCodeSizeMultiplier = 120;
 #else
 #error Unsupported target architecture.
 #endif
@@ -320,6 +323,13 @@ class FullCodeGenerator: public AstVisitor {
              Label* if_true,
              Label* if_false,
              Label* fall_through);
+#elif V8_TARGET_ARCH_MIPS64
+  void Split(Condition cc,
+             Register lhs,
+             const Operand&  rhs,
+             Label* if_true,
+             Label* if_false,
+             Label* fall_through);
 #else  // All non-mips arch.
   void Split(Condition cc,
              Label* if_true,