Add Uint32 representation

runtime/vm/flow_graph_optimizer.h

Index: runtime/vm/flow_graph_optimizer.h
diff --git a/runtime/vm/flow_graph_optimizer.h b/runtime/vm/flow_graph_optimizer.h
index 5b05ea737739db1a9cd7d1e58f9f0b48fc9801b4..7f524cc5eb7d83585864665df32c23792249da21 100644
--- a/runtime/vm/flow_graph_optimizer.h
+++ b/runtime/vm/flow_graph_optimizer.h
@@ -34,6 +34,7 @@ class FlowGraphOptimizer : public FlowGraphVisitor {
   // Merge instructions (only per basic-block).
   void TryOptimizePatterns();
 
+
   // Returns true if any instructions were canonicalized away.
   bool Canonicalize();
 
@@ -43,6 +44,9 @@ class FlowGraphOptimizer : public FlowGraphVisitor {
 
   void InferIntRanges();
 
+  // Optimize mint operations using range analysis output.
+  void TryRangeDerivedOptimizations();
+
   void AnalyzeTryCatch();
 
   bool TryInlineRecognizedMethod(intptr_t receiver_cid,
@@ -238,6 +242,8 @@ class FlowGraphOptimizer : public FlowGraphVisitor {
   void OptimizeLeftShiftBitAndSmiOp(Definition* bit_and_instr,
                                     Definition* left_instr,
                                     Definition* right_instr);
+  Definition* OptimizeMint32BitMasks(BinaryMintOpInstr* mask);
+  bool TryMarkMint32Bit(Definition* mintop);
   void TryMergeTruncDivMod(GrowableArray<BinarySmiOpInstr*>* merge_candidates);
   void TryMergeMathUnary(GrowableArray<MathUnaryInstr*>* merge_candidates);