Make constants computations instead of values.

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index 6476a7298dfd895e4929f63d32a77118e75c6f76..85aae126d65d502a26d22d7eb819325e12cfa1e2 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -169,16 +169,16 @@ void StoreLocalComp::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
-LocationSummary* MaterializeComp::MakeLocationSummary() const {
+LocationSummary* ConstantComp::MakeLocationSummary() const {
   return LocationSummary::Make(0,
                                Location::RequiresRegister(),
                                LocationSummary::kNoCall);
 }
 
 
-void MaterializeComp::EmitNativeCode(FlowGraphCompiler* compiler) {
+void ConstantComp::EmitNativeCode(FlowGraphCompiler* compiler) {
   Register result = locs()->out().reg();
-  __ LoadObject(result, constant_val()->value());
+  __ LoadObject(result, value());
 }