Merge V8 at r7668: Initial merge by Git.

Change-Id: I1703c8b4f5c63052451a22cf3fb878abc9a0ec75
diff --git a/src/scopeinfo.h b/src/scopeinfo.h
index cc9f816..2552af2 100644
--- a/src/scopeinfo.h
+++ b/src/scopeinfo.h
@@ -220,7 +220,7 @@
       ASSERT(index == this->index());
     }
 
-    inline Value(uint32_t value) : value_(value) {}
+    explicit inline Value(uint32_t value) : value_(value) {}
 
     uint32_t raw() { return value_; }