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 7f0e2207de3d224a0e88414bd6ff8e346cc06ea5..3aecb910f784ab23227db1ab22ab68d93eddbc17 100644
--- a/runtime/vm/flow_graph_optimizer.h
+++ b/runtime/vm/flow_graph_optimizer.h
@@ -43,6 +43,8 @@ class FlowGraphOptimizer : public FlowGraphVisitor {
 
   void InferIntRanges();
 
+  void SelectIntegerInstructions();
+
   void AnalyzeTryCatch();
 
   bool TryInlineRecognizedMethod(intptr_t receiver_cid,
@@ -356,6 +358,8 @@ class ConstantPropagator : public FlowGraphVisitor {
                       const Value& left,
                       const Value& right);
 
+  void TruncateInteger(Definition* instr, int64_t mask);
+
   virtual void VisitBlocks() { UNREACHABLE(); }
 
 #define DECLARE_VISIT(type) virtual void Visit##type(type##Instr* instr);