Add fast path smi comparison operators.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index 14543eacede30acabb95060edd50ca3bbdb91c98..7799bd9e9a0360734b4bc269c1330a373162b9aa 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -2963,6 +2963,24 @@ void CheckedSmiOpInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
     case Token::kBIT_XOR:
       __ xor_(result, left, right);
       break;
+    case Token::kEQ:
+    case Token::kLT:
+    case Token::kLTE:
+    case Token::kGT:
+    case Token::kGTE: {
+      Label true_label, false_label, done;
+      BranchLabels labels = { &true_label, &false_label, &false_label };
+      Condition true_condition =
+          EmitSmiComparisonOp(compiler, *locs(), op_kind());
+      EmitBranchOnCondition(compiler, true_condition, labels);
+      __ Bind(&false_label);
+      __ LoadObject(result, Bool::False());
+      __ b(&done);
+      __ Bind(&true_label);
+      __ LoadObject(result, Bool::True());
+      __ Bind(&done);
+      break;
+    }
     default:
       UNIMPLEMENTED();
   }