Support Int32 representation for selected binary operations.

runtime/vm/flow_graph_type_propagator.cc

Index: runtime/vm/flow_graph_type_propagator.cc
diff --git a/runtime/vm/flow_graph_type_propagator.cc b/runtime/vm/flow_graph_type_propagator.cc
index 37715ed965671f187aaeac418a80667b4c072a02..f702ed5a1e1721f86eb496dcf525c8ce1ad9b43c 100644
--- a/runtime/vm/flow_graph_type_propagator.cc
+++ b/runtime/vm/flow_graph_type_propagator.cc
@@ -1009,6 +1009,12 @@ CompileType LoadFieldInstr::ComputeType() const {
 }
 
 
+CompileType BinaryInt32OpInstr::ComputeType() const {
+  // TODO(vegorov): range analysis information shall be used here.
+  return CompileType::Int();
+}
+
+
 CompileType BinarySmiOpInstr::ComputeType() const {
   return CompileType::FromCid(kSmiCid);
 }
@@ -1063,6 +1069,21 @@ bool BoxIntegerInstr::RecomputeType() {
 }
 
 
+CompileType BoxIntNInstr::ComputeType() const {
+  return ValueFitsSmi() ? CompileType::FromCid(kSmiCid) : CompileType::Int();
+}
+
+
+CompileType UnboxIntNInstr::ComputeType() const {
+  return CompileType::Int();
+}
+
+
+bool BoxIntNInstr::RecomputeType() {
+  return UpdateType(ComputeType());
+}
+
+
 CompileType UnboxIntegerInstr::ComputeType() const {
   return CompileType::Int();
 }
@@ -1305,6 +1326,11 @@ CompileType BoxInt32x4Instr::ComputeType() const {
 }
 
 
+CompileType Int32ToDoubleInstr::ComputeType() const {
+  return CompileType::FromCid(kDoubleCid);
+}
+
+
 CompileType SmiToDoubleInstr::ComputeType() const {
   return CompileType::FromCid(kDoubleCid);
 }