Correctify instanceof and make it optimizable.

src/full-codegen/arm/full-codegen-arm.cc

Index: src/full-codegen/arm/full-codegen-arm.cc
diff --git a/src/full-codegen/arm/full-codegen-arm.cc b/src/full-codegen/arm/full-codegen-arm.cc
index 891888d232def562938c690516bb0c84a7326abe..c774b6d9aea56cd1b7c184546c778986de42f03d 100644
--- a/src/full-codegen/arm/full-codegen-arm.cc
+++ b/src/full-codegen/arm/full-codegen-arm.cc
@@ -5088,18 +5088,17 @@ void FullCodeGenerator::VisitCompareOperation(CompareOperation* expr) {
       VisitForStackValue(expr->right());
       __ InvokeBuiltin(Builtins::IN, CALL_FUNCTION);
       PrepareForBailoutBeforeSplit(expr, false, NULL, NULL);
-      __ LoadRoot(ip, Heap::kTrueValueRootIndex);
-      __ cmp(r0, ip);
+      __ CompareRoot(r0, Heap::kTrueValueRootIndex);
       Split(eq, if_true, if_false, fall_through);
       break;
 
     case Token::INSTANCEOF: {
-      VisitForStackValue(expr->right());
-      InstanceofStub stub(isolate(), InstanceofStub::kNoFlags);
+      VisitForAccumulatorValue(expr->right());
+      __ pop(r1);
+      InstanceOfStub stub(isolate());
       __ CallStub(&stub);
-      PrepareForBailoutBeforeSplit(expr, true, if_true, if_false);
-      // The stub returns 0 for true.
-      __ tst(r0, r0);
+      PrepareForBailoutBeforeSplit(expr, false, NULL, NULL);
+      __ CompareRoot(r0, Heap::kTrueValueRootIndex);
       Split(eq, if_true, if_false, fall_through);
       break;
     }