Initial implementation of sparse conditional constant propagation.

runtime/vm/object.h

Index: runtime/vm/object.h
diff --git a/runtime/vm/object.h b/runtime/vm/object.h
index a9344b37ed4794bd176a9c884a6e30986594374c..34feb9845afb0f7ef65c3f44486cc0d108ff7b99 100644
--- a/runtime/vm/object.h
+++ b/runtime/vm/object.h
@@ -3245,6 +3245,11 @@ class Integer : public Number {
   // Returns 0, -1 or 1.
   virtual int CompareWith(const Integer& other) const;
 
+  static RawInteger* AsInteger(const Integer& value);
+  static RawInteger* BinaryOp(Token::Kind operation,
+                              const Integer& left,
+                              const Integer& right);
+
   OBJECT_IMPLEMENTATION(Integer, Number);
   friend class Class;
 };
@@ -3386,6 +3391,11 @@ class Bigint : public Integer {
   static RawBigint* New(const String& str, Heap::Space space = Heap::kNew);
   static RawBigint* New(int64_t value, Heap::Space space = Heap::kNew);
 
+  static RawBigint* AsBigint(const Integer& value);
+  static RawBigint* BinaryOp(Token::Kind operation,
+                             const Bigint& left,
+                             const Bigint& right);
+
  private:
   Chunk GetChunkAt(intptr_t i) const {
     return *ChunkAddr(i);