Merge ConstantInstr -> UnboxDouble to UnboxedConstant. Reduces register usage and allows for variou…

runtime/vm/intermediate_language_arm64.cc

Index: runtime/vm/intermediate_language_arm64.cc
===================================================================
--- runtime/vm/intermediate_language_arm64.cc	(revision 35632)
+++ runtime/vm/intermediate_language_arm64.cc	(working copy)
@@ -202,6 +202,19 @@
 }
 
 
+LocationSummary* UnboxedConstantInstr::MakeLocationSummary(bool opt) const {
+  const intptr_t kNumInputs = 0;
+  return LocationSummary::Make(kNumInputs,
+                               Location::RequiresFpuRegister(),
+                               LocationSummary::kNoCall);
+}
+
+
+void UnboxedConstantInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
+  UNIMPLEMENTED();
+}
+
+
 LocationSummary* AssertAssignableInstr::MakeLocationSummary(bool opt) const {
   const intptr_t kNumInputs = 3;
   const intptr_t kNumTemps = 0;