Update V8 to r6101 as required by WebKit r74534

Change-Id: I7f84af8dd732f11898fd644b2c2b1538914cb78d
diff --git a/src/global-handles.cc b/src/global-handles.cc
index 5339840..18cdc5a 100644
--- a/src/global-handles.cc
+++ b/src/global-handles.cc
@@ -30,6 +30,8 @@
 #include "api.h"
 #include "global-handles.h"
 
+#include "vm-state-inl.h"
+
 namespace v8 {
 namespace internal {