Simple redundant load elimination.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
===================================================================
--- runtime/vm/intermediate_language.cc	(revision 12420)
+++ runtime/vm/intermediate_language.cc	(working copy)
@@ -72,6 +72,20 @@
 }
 
 
+bool BinarySmiOpInstr::AttributesEqual(Definition* other) const {
+  BinarySmiOpInstr* other_op = other->AsBinarySmiOp();
+  ASSERT(other_op != NULL);
+  return op_kind() == other_op->op_kind();
+}
+
+
+bool StrictCompareInstr::AttributesEqual(Definition* other) const {
+  StrictCompareInstr* other_op = other->AsStrictCompare();
+  ASSERT(other_op != NULL);
+  return kind() == other_op->kind();
+}
+
+
 bool LoadFieldInstr::AttributesEqual(Definition* other) const {
   LoadFieldInstr* other_load = other->AsLoadField();
   ASSERT(other_load != NULL);