Inline toDouble calls on mints

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 040e2ec61bea5ac9629babba9f9cef7110e51564..a49bf9bcc2cd2b6c05048bc68e23b7872e046f09 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -4638,6 +4638,18 @@ void SmiToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
 }
 
 
+LocationSummary* MintToDoubleInstr::MakeLocationSummary(Isolate* isolate,
+                                                        bool opt) const {
+  UNIMPLEMENTED();
+  return NULL;
+}
+
+
+void MintToDoubleInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  UNIMPLEMENTED();
+}
+
+
 LocationSummary* DoubleToIntegerInstr::MakeLocationSummary(Isolate* isolate,
                                                            bool opt) const {
   const intptr_t kNumInputs = 1;