[turbofan] Reland of `Add alignment parameter to StackSlot operator`

src/compiler/raw-machine-assembler.h

 // Copyright 2014 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_COMPILER_RAW_MACHINE_ASSEMBLER_H_
 #define V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_
 
 #include "src/assembler.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/graph.h"
@@ skipping 66 matching lines @@
   }
   Node* IntPtrConstant(intptr_t value) {
     // TODO(dcarney): mark generated code as unserializable if value != 0.
     return kPointerSize == 8 ? Int64Constant(value)
                              : Int32Constant(static_cast<int>(value));
   }
   Node* RelocatableIntPtrConstant(intptr_t value, RelocInfo::Mode rmode);
   Node* Int32Constant(int32_t value) {
     return AddNode(common()->Int32Constant(value));
   }
-  Node* StackSlot(MachineRepresentation rep) {
-    return AddNode(machine()->StackSlot(rep));
+  Node* StackSlot(MachineRepresentation rep, int alignment = 0) {
+    return AddNode(machine()->StackSlot(rep, alignment));
   }
   Node* Int64Constant(int64_t value) {
     return AddNode(common()->Int64Constant(value));
   }
   Node* NumberConstant(double value) {
     return AddNode(common()->NumberConstant(value));
   }
   Node* Float32Constant(float value) {
     return AddNode(common()->Float32Constant(value));
   }
@@ skipping 801 matching lines @@
   bool deferred_;
   friend class RawMachineAssembler;
   DISALLOW_COPY_AND_ASSIGN(RawMachineLabel);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_RAW_MACHINE_ASSEMBLER_H_