[es6] Reintroduce the instanceof operator in the backends.

src/crankshaft/hydrogen-instructions.cc

Index: src/crankshaft/hydrogen-instructions.cc
diff --git a/src/crankshaft/hydrogen-instructions.cc b/src/crankshaft/hydrogen-instructions.cc
index 5241dd4bae67b9c0716bc3e55ac2ecf7acccd30a..5e4ad3714aee9d7176fdc81e5b783b097d311b8d 100644
--- a/src/crankshaft/hydrogen-instructions.cc
+++ b/src/crankshaft/hydrogen-instructions.cc
@@ -798,7 +798,6 @@ bool HInstruction::CanDeoptimize() {
     case HValue::kHasCachedArrayIndexAndBranch:
     case HValue::kHasInstanceTypeAndBranch:
     case HValue::kInnerAllocatedObject:
-    case HValue::kInstanceOf:
     case HValue::kIsSmiAndBranch:
     case HValue::kIsStringAndBranch:
     case HValue::kIsUndetectableAndBranch:
@@ -1652,12 +1651,6 @@ std::ostream& HUnknownOSRValue::PrintDataTo(std::ostream& os) const {  // NOLINT
 }
 
 
-std::ostream& HInstanceOf::PrintDataTo(std::ostream& os) const {  // NOLINT
-  return os << NameOf(left()) << " " << NameOf(right()) << " "
-            << NameOf(context());
-}
-
-
 Range* HValue::InferRange(Zone* zone) {
   Range* result;
   if (representation().IsSmi() || type().IsSmi()) {