Update V8 to r5318 to fix crashing ARM bugs

Bug: 2947054
Change-Id: I9c7398edb1525477c75ace9d383efaf790d12c51
diff --git a/src/execution.cc b/src/execution.cc
index a6b15cc..5421678 100644
--- a/src/execution.cc
+++ b/src/execution.cc
@@ -710,7 +710,7 @@
       : data_(data),
         length_(length) {}
 
-  virtual ~SimpleStringResource() { delete data_; }
+  virtual ~SimpleStringResource() { delete[] data_; }
 
   virtual const Char* data() const { return data_; }