[crankshaft] Remove the useless HAllocateBlockContext instruction.

src/crankshaft/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/crankshaft/hydrogen-instructions.h"
 
 #include "src/base/bits.h"
 #include "src/base/safe_math.h"
 #include "src/crankshaft/hydrogen-infer-representation.h"
 #include "src/double.h"
@@ skipping 810 matching lines @@
     case HValue::kStoreNamedGeneric:
     case HValue::kStringCharCodeAt:
     case HValue::kStringCharFromCode:
     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:
     case HValue::kBoundsCheck:
     case HValue::kBranch:
     case HValue::kCallJSFunction:
     case HValue::kCallRuntime:
     case HValue::kCallWithDescriptor:
     case HValue::kChange:
     case HValue::kCheckArrayBufferNotNeutered:
     case HValue::kCheckHeapObject:
@@ skipping 254 matching lines @@
 }
 
 
 std::ostream& HAccessArgumentsAt::PrintDataTo(
     std::ostream& os) const {  // NOLINT
   return os << NameOf(arguments()) << "[" << NameOf(index()) << "], length "
             << NameOf(length());
 }
 
 
-std::ostream& HAllocateBlockContext::PrintDataTo(
-    std::ostream& os) const {  // NOLINT
-  return os << NameOf(context()) << " " << NameOf(function());
-}
-
-
 std::ostream& HControlInstruction::PrintDataTo(
     std::ostream& os) const {  // NOLINT
   os << " goto (";
   bool first_block = true;
   for (HSuccessorIterator it(this); !it.Done(); it.Advance()) {
     if (!first_block) os << ", ";
     os << *it.Current();
     first_block = false;
   }
   return os << ")";
@@ skipping 3528 matching lines @@
     case HObjectAccess::kExternalMemory:
       os << "[external-memory]";
       break;
   }
 
   return os << "@" << access.offset();
 }
 
 }  // namespace internal
 }  // namespace v8