[turbofan] Add the StackSlot operator to turbofan.

src/compiler/instruction-scheduler.cc

 // Copyright 2015 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/compiler/instruction-scheduler.h"
 
 #include "src/base/adapters.h"
 
 namespace v8 {
 namespace internal {
@@ skipping 157 matching lines @@
   }
 }
 
 
 int InstructionScheduler::GetInstructionFlags(const Instruction* instr) const {
   switch (instr->arch_opcode()) {
     case kArchNop:
     case kArchStackPointer:
     case kArchFramePointer:
     case kArchTruncateDoubleToI:
+    case kArchStackSlot:
       return kNoOpcodeFlags;
 
     case kArchPrepareCallCFunction:
     case kArchPrepareTailCall:
     case kArchCallCFunction:
     case kArchCallCodeObject:
     case kArchCallJSFunction:
     case kArchLazyBailout:
       return kHasSideEffect;
 
@@ skipping 83 matching lines @@
       }
     }
 
     node->set_total_latency(max_latency + node->latency());
   }
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8