Implement a variation of scalar replacement for non-escaping allocations.

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 031a5edc7df3842f3f7da66c5722901d6fe637c5..ebac00acb4df3ae018b1d00e7daca01e4665f3dd 100644
--- a/runtime/vm/il_printer.cc
+++ b/runtime/vm/il_printer.cc
@@ -494,6 +494,16 @@ void AllocateObjectWithBoundsCheckInstr::PrintOperandsTo(
 }
 
 
+void MaterializeObjectInstr::PrintOperandsTo(BufferFormatter* f) const {
+  f->Print("%s", String::Handle(cls_.Name()).ToCString());
+  for (intptr_t i = 0; i < InputCount(); i++) {
+    f->Print(", ");
+    f->Print("%s: ", String::Handle(fields_[i]->name()).ToCString());
+    InputAt(i)->PrintTo(f);
+  }
+}
+
+
 void CreateArrayInstr::PrintOperandsTo(BufferFormatter* f) const {
   for (int i = 0; i < ArgumentCount(); ++i) {
     if (i != 0) f->Print(", ");