Support Int32 representation for selected binary operations.

runtime/vm/locations.cc

Index: runtime/vm/locations.cc
diff --git a/runtime/vm/locations.cc b/runtime/vm/locations.cc
index 0024b68028613d260aec6bb35ee5703cb8eb3d5c..c0ef26eb45da68f255f52516be7c44b94b312ef9 100644
--- a/runtime/vm/locations.cc
+++ b/runtime/vm/locations.cc
@@ -71,7 +71,7 @@ PairLocation* Location::AsPairLocation() const {
 Location Location::RegisterOrConstant(Value* value) {
   ConstantInstr* constant = value->definition()->AsConstant();
   return ((constant != NULL) && Assembler::IsSafe(constant->value()))
-      ? Location::Constant(constant->value())
+      ? Location::Constant(constant)
       : Location::RequiresRegister();
 }
 
@@ -79,7 +79,7 @@ Location Location::RegisterOrConstant(Value* value) {
 Location Location::RegisterOrSmiConstant(Value* value) {
   ConstantInstr* constant = value->definition()->AsConstant();
   return ((constant != NULL) && Assembler::IsSafeSmi(constant->value()))
-      ? Location::Constant(constant->value())
+      ? Location::Constant(constant)
       : Location::RequiresRegister();
 }
 
@@ -87,7 +87,7 @@ Location Location::RegisterOrSmiConstant(Value* value) {
 Location Location::WritableRegisterOrSmiConstant(Value* value) {
   ConstantInstr* constant = value->definition()->AsConstant();
   return ((constant != NULL) && Assembler::IsSafeSmi(constant->value()))
-      ? Location::Constant(constant->value())
+      ? Location::Constant(constant)
       : Location::WritableRegister();
 }
 
@@ -95,7 +95,7 @@ Location Location::WritableRegisterOrSmiConstant(Value* value) {
 Location Location::FixedRegisterOrConstant(Value* value, Register reg) {
   ConstantInstr* constant = value->definition()->AsConstant();
   return ((constant != NULL) && Assembler::IsSafe(constant->value()))
-      ? Location::Constant(constant->value())
+      ? Location::Constant(constant)
       : Location::RegisterLocation(reg);
 }
 
@@ -103,7 +103,7 @@ Location Location::FixedRegisterOrConstant(Value* value, Register reg) {
 Location Location::FixedRegisterOrSmiConstant(Value* value, Register reg) {
   ConstantInstr* constant = value->definition()->AsConstant();
   return ((constant != NULL) && Assembler::IsSafeSmi(constant->value()))
-      ? Location::Constant(constant->value())
+      ? Location::Constant(constant)
       : Location::RegisterLocation(reg);
 }
 
@@ -111,7 +111,7 @@ Location Location::FixedRegisterOrSmiConstant(Value* value, Register reg) {
 Location Location::AnyOrConstant(Value* value) {
   ConstantInstr* constant = value->definition()->AsConstant();
   return ((constant != NULL) && Assembler::IsSafe(constant->value()))
-      ? Location::Constant(constant->value())
+      ? Location::Constant(constant)
       : Location::Any();
 }
 
@@ -140,6 +140,11 @@ intptr_t Location::ToStackSlotOffset() const {
 }
 
 
+const Object& Location::constant() const {
+  return constant_instruction()->value();
+}
+
+
 const char* Location::Name() const {
   switch (kind()) {
     case kInvalid: return "?";