Adds a flag to the standalone vm to throw an exception on 53-bit integer overflow.

runtime/vm/object.h

Index: runtime/vm/object.h
===================================================================
--- runtime/vm/object.h	(revision 23032)
+++ runtime/vm/object.h	(working copy)
@@ -3927,9 +3927,14 @@
 
   static RawInteger* New(int64_t value, Heap::Space space = Heap::kNew);
 
+  // Check if an Integer exceeds 53 bits, and if so throw an exception.
+  static void CheckForFiftyThreeBitOverflow(const Integer& i, const char* msg);
+
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
 
+  virtual bool FitsIn53Bits() const;
+
   // Returns 0, -1 or 1.
   virtual int CompareWith(const Integer& other) const;
 
@@ -3969,6 +3974,8 @@
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
 
+  virtual bool FitsIn53Bits() const { return true; }
+
   virtual int CompareWith(const Integer& other) const;
 
   static intptr_t InstanceSize() { return 0; }
@@ -4050,6 +4057,8 @@
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
 
+  virtual bool FitsIn53Bits() const;
+
   virtual int CompareWith(const Integer& other) const;
 
   static intptr_t InstanceSize() {
@@ -4087,6 +4096,8 @@
   virtual double AsDoubleValue() const;
   virtual int64_t AsInt64Value() const;
 
+  virtual bool FitsIn53Bits() const { return false; }
+
   virtual int CompareWith(const Integer& other) const;
 
   static const intptr_t kBytesPerElement = kChunkSize;