[crankshaft] Remove the useless HAllocateBlockContext instruction.

src/crankshaft/hydrogen-instructions.h

 // 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.
 
 #ifndef V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 #define V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 30 matching lines @@
   V(BinaryOperation)                          \
   V(BitwiseBinaryOperation)                   \
   V(ControlInstruction)                       \
   V(Instruction)
 
 
 #define HYDROGEN_CONCRETE_INSTRUCTION_LIST(V) \
   V(AbnormalExit)                             \
   V(AccessArgumentsAt)                        \
   V(Add)                                      \
-  V(AllocateBlockContext)                     \
   V(Allocate)                                 \
   V(ApplyArguments)                           \
   V(ArgumentsElements)                        \
   V(ArgumentsLength)                          \
   V(ArgumentsObject)                          \
   V(Bitwise)                                  \
   V(BlockEntry)                               \
   V(BoundsCheck)                              \
   V(BoundsCheckBaseIndexInformation)          \
   V(Branch)                                   \
@@ skipping 7599 matching lines @@
   DECLARE_CONCRETE_INSTRUCTION(StoreFrameContext)
  private:
   explicit HStoreFrameContext(HValue* context)
       : HUnaryOperation(context) {
     set_representation(Representation::Tagged());
     SetChangesFlag(kContextSlots);
   }
 };
 
 
-class HAllocateBlockContext: public HTemplateInstruction<2> {
- public:
-  DECLARE_INSTRUCTION_FACTORY_P3(HAllocateBlockContext, HValue*,
-                                 HValue*, Handle<ScopeInfo>);
-  HValue* context() const { return OperandAt(0); }
-  HValue* function() const { return OperandAt(1); }
-  Handle<ScopeInfo> scope_info() const { return scope_info_; }
-
-  Representation RequiredInputRepresentation(int index) override {
-    return Representation::Tagged();
-  }
-
-  std::ostream& PrintDataTo(std::ostream& os) const override;  // NOLINT
-
-  DECLARE_CONCRETE_INSTRUCTION(AllocateBlockContext)
-
- private:
-  HAllocateBlockContext(HValue* context,
-                        HValue* function,
-                        Handle<ScopeInfo> scope_info)
-      : scope_info_(scope_info) {
-    SetOperandAt(0, context);
-    SetOperandAt(1, function);
-    set_representation(Representation::Tagged());
-  }
-
-  Handle<ScopeInfo> scope_info_;
-};
-
-
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_HYDROGEN_INSTRUCTIONS_H_