update V8 to TOT snapshot branch
diff --git a/src/macro-assembler.h b/src/macro-assembler.h
index e33148c..81e5bf7 100644
--- a/src/macro-assembler.h
+++ b/src/macro-assembler.h
@@ -61,6 +61,8 @@
   RESULT_CONTAINS_TOP = 1 << 1
 };
 
+// Invalid depth in prototype chain.
+const int kInvalidProtoDepth = -1;
 
 #if V8_TARGET_ARCH_IA32
 #include "assembler.h"