Simple array bounds check elimination on top of range analysis framework.

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 c847c2ef74dd74225c89be060e65910cb4409403..3984e9d770c84ffd95b23dcbd278475d6095bd5d 100644
--- a/runtime/vm/il_printer.cc
+++ b/runtime/vm/il_printer.cc
@@ -251,6 +251,14 @@ void RangeBoundary::PrintTo(BufferFormatter* f) const {
 }
 
 
+const char* RangeBoundary::ToCString() const {
+  char buffer[256];
+  BufferFormatter f(buffer, sizeof(buffer));
+  PrintTo(&f);
+  return Isolate::Current()->current_zone()->MakeCopyOfString(buffer);
+}
+
+
 void AssertAssignableInstr::PrintOperandsTo(BufferFormatter* f) const {
   value()->PrintTo(f);
   f->Print(", %s, '%s'%s",