Fix issue 20190: Mark Uint32/Int32 typed data load to produce a Mint always

runtime/vm/intermediate_language.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_INTERMEDIATE_LANGUAGE_H_
 #define VM_INTERMEDIATE_LANGUAGE_H_
 
 #include "vm/allocation.h"
 #include "vm/ast.h"
 #include "vm/growable_array.h"
@@ skipping 4234 matching lines @@
 
   Value* array() const { return inputs_[0]; }
   Value* index() const { return inputs_[1]; }
   intptr_t index_scale() const { return index_scale_; }
   intptr_t class_id() const { return class_id_; }
 
   virtual bool CanDeoptimize() const {
     return deopt_id_ != Isolate::kNoDeoptId;
   }
 
+  bool Typed32BitIsSmi() const {
+    return kSmiBits >= 32;
+  }
 
   virtual Representation representation() const;
   virtual void InferRange();
 
   virtual bool AllowsCSE() const { return false; }
   virtual EffectSet Effects() const { return EffectSet::None(); }
   virtual EffectSet Dependencies() const;
   virtual bool AttributesEqual(Instruction* other) const;
 
   virtual bool MayThrow() const { return false; }
@@ skipping 4361 matching lines @@
   ForwardInstructionIterator* current_iterator_;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FlowGraphVisitor);
 };
 
 
 }  // namespace dart
 
 #endif  // VM_INTERMEDIATE_LANGUAGE_H_