Convert CurrentContext and StoreContext to locations code generation scheme

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 5fe8d27964e18d21330ddd6eab77d8ca6a9eacc0..893480127f62cae1f2e280c4b5faeeeaccfdfef0 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -46,6 +46,29 @@ static LocationSummary* MakeSimpleLocationSummary(
 }
 
 
+LocationSummary* CurrentContextComp::MakeLocationSummary() {
+  return MakeSimpleLocationSummary(0, Location::RequiresRegister());
+}
+
+
+void CurrentContextComp::EmitNativeCode(FlowGraphCompiler* compiler) {
+  __ movq(locs()->out().reg(), CTX);
+}
+
+
+LocationSummary* StoreContextComp::MakeLocationSummary() {
+  LocationSummary* summary = new LocationSummary(1);
+  summary->set_in(0, Location::RegisterLocation(CTX));
+  return summary;
+}
+
+
+void StoreContextComp::EmitNativeCode(FlowGraphCompiler* compiler) {
+  // Nothing to do.  Context register were loaded by register allocator.
+  ASSERT(locs()->in(0).reg() == CTX);
+}
+
+
 LocationSummary* StrictCompareComp::MakeLocationSummary() {
   return MakeSimpleLocationSummary(2, Location::SameAsFirstInput());
 }