Encapsulate megamorphic load/tail-call in hydrogen

src/hydrogen-instructions.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/base/bits.h"
 #include "src/double.h"
 #include "src/factory.h"
 #include "src/hydrogen-infer-representation.h"
@@ skipping 828 matching lines @@
     case HValue::kRegExpLiteral:
     case HValue::kReturn:
     case HValue::kSeqStringGetChar:
     case HValue::kStoreCodeEntry:
     case HValue::kStoreFrameContext:
     case HValue::kStoreKeyed:
     case HValue::kStoreNamedField:
     case HValue::kStoreNamedGeneric:
     case HValue::kStringCharCodeAt:
     case HValue::kStringCharFromCode:
+    case HValue::kTailCallThroughMegamorphicCache:
     case HValue::kThisFunction:
     case HValue::kTypeofIsAndBranch:
     case HValue::kUnknownOSRValue:
     case HValue::kUseConst:
       return false;
 
     case HValue::kAdd:
     case HValue::kAllocateBlockContext:
     case HValue::kApplyArguments:
     case HValue::kBitwise:
@@ skipping 836 matching lines @@
   return HUnaryOperation::PrintDataTo(os);
 }
 
 
 OStream& HCallStub::PrintDataTo(OStream& os) const {  // NOLINT
   os << CodeStub::MajorName(major_key_, false) << " ";
   return HUnaryCall::PrintDataTo(os);
 }
 
 
+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";
   if (environment_->is_special_index(index_)) type = "special";
   if (environment_->is_parameter_index(index_)) type = "parameter";
   return os << type << " @ " << index_;
 }
 
 
 OStream& HInstanceOf::PrintDataTo(OStream& os) const {  // NOLINT
@@ skipping 3043 matching lines @@
       break;
     case HObjectAccess::kExternalMemory:
       os << "[external-memory]";
       break;
   }
 
   return os << "@" << access.offset();
 }
 
 } }  // namespace v8::internal