[crankshaft] Remove the useless HCallStub instruction.

src/crankshaft/x64/lithium-x64.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_X64_LITHIUM_X64_H_
 #define V8_CRANKSHAFT_X64_LITHIUM_X64_H_
 
 #include "src/crankshaft/hydrogen.h"
 #include "src/crankshaft/lithium.h"
 #include "src/crankshaft/lithium-allocator.h"
@@ skipping 17 matching lines @@
   V(ArithmeticD)                             \
   V(ArithmeticT)                             \
   V(BitI)                                    \
   V(BoundsCheck)                             \
   V(Branch)                                  \
   V(CallJSFunction)                          \
   V(CallWithDescriptor)                      \
   V(CallFunction)                            \
   V(CallNewArray)                            \
   V(CallRuntime)                             \
-  V(CallStub)                                \
   V(CheckArrayBufferNotNeutered)             \
   V(CheckInstanceType)                       \
   V(CheckMaps)                               \
   V(CheckMapValue)                           \
   V(CheckNonSmi)                             \
   V(CheckSmi)                                \
   V(CheckValue)                              \
   V(ClampDToUint8)                           \
   V(ClampIToUint8)                           \
   V(ClampTToUint8)                           \
@@ skipping 406 matching lines @@
 };
 
 
 class LParameter final : public LTemplateInstruction<1, 0, 0> {
  public:
   bool HasInterestingComment(LCodeGen* gen) const override { return false; }
   DECLARE_CONCRETE_INSTRUCTION(Parameter, "parameter")
 };
 
 
-class LCallStub final : public LTemplateInstruction<1, 1, 0> {
- public:
-  explicit LCallStub(LOperand* context) {
-    inputs_[0] = context;
-  }
-
-  LOperand* context() { return inputs_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(CallStub, "call-stub")
-  DECLARE_HYDROGEN_ACCESSOR(CallStub)
-};
-
-
 class LUnknownOSRValue final : public LTemplateInstruction<1, 0, 0> {
  public:
   bool HasInterestingComment(LCodeGen* gen) const override { return false; }
   DECLARE_CONCRETE_INSTRUCTION(UnknownOSRValue, "unknown-osr-value")
 };
 
 
 template<int I, int T>
 class LControlInstruction : public LTemplateInstruction<0, I, T> {
  public:
@@ skipping 2239 matching lines @@
   DISALLOW_COPY_AND_ASSIGN(LChunkBuilder);
 };
 
 #undef DECLARE_HYDROGEN_ACCESSOR
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CRANKSHAFT_X64_LITHIUM_X64_H_