Encapsulate megamorphic load/tail-call in hydrogen

src/hydrogen-instructions.cc

Index: src/hydrogen-instructions.cc
diff --git a/src/hydrogen-instructions.cc b/src/hydrogen-instructions.cc
index 15f4dabb4dba7b4366b1be9308c379e0510ef523..44e1492cfbe1aa00d3d6a834af7dabcadce66679 100644
--- a/src/hydrogen-instructions.cc
+++ b/src/hydrogen-instructions.cc
@@ -846,6 +846,7 @@ bool HInstruction::CanDeoptimize() {
     case HValue::kStoreNamedGeneric:
     case HValue::kStringCharCodeAt:
     case HValue::kStringCharFromCode:
+    case HValue::kTailCallThroughMegamorphicCache:
     case HValue::kThisFunction:
     case HValue::kTypeofIsAndBranch:
     case HValue::kUnknownOSRValue:
@@ -1702,6 +1703,15 @@ OStream& HCallStub::PrintDataTo(OStream& os) const {  // NOLINT
 }
 
 
+OStream& HTailCallThroughMegamorphicCache::PrintDataTo(
+    OStream& os) const {  // NOLINT
+  for (int i = 0; i < OperandCount(); i++) {
+    os << NameOf(OperandAt(i)) << " ";
+  }
+  return os << "flags: " << flags();
+}
+
+
 OStream& HUnknownOSRValue::PrintDataTo(OStream& os) const {  // NOLINT
   const char* type = "expression";
   if (environment_->is_local_index(index_)) type = "local";