Implement kDoubleToDouble and kIntegerToDouble on ia32 and x64.

runtime/vm/il_printer.cc

Index: runtime/vm/il_printer.cc
diff --git a/runtime/vm/il_printer.cc b/runtime/vm/il_printer.cc
index d64bfdcf72559ec78b945c564c54c58df6721f5a..8352bdaff67925419459ac5e6ae6388def243633 100644
--- a/runtime/vm/il_printer.cc
+++ b/runtime/vm/il_printer.cc
@@ -323,6 +323,13 @@ void UnarySmiOpComp::PrintOperandsTo(BufferFormatter* f) const {
 }
 
 
+void ToDoubleComp::PrintOperandsTo(BufferFormatter* f) const {
+  ASSERT(from() == kDouble || from() == kSmi);
+  f->Print("%s ", from() == kDouble ? "double2double" : "smi2double");
+  value()->PrintTo(f);
+}
+
+
 void GraphEntryInstr::PrintTo(BufferFormatter* f) const {
   f->Print("%2d: [graph]", block_id());
 }