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

src/compiler/arm64/instruction-selector-arm64.cc

 // 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.
 
 #include "src/assembler-inl.h"
 #include "src/compiler/instruction-selector-impl.h"
 #include "src/compiler/node-matchers.h"
 #include "src/compiler/node-properties.h"
 
 namespace v8 {
@@ skipping 509 matching lines @@
     uint64_t value_minus_one = m->right().Value() - 1;
     if (base::bits::IsPowerOfTwo64(value_minus_one)) {
       return WhichPowerOf2_64(value_minus_one);
     }
   }
   return 0;
 }
 
 }  // namespace
 
+void InstructionSelector::VisitStackSlot(Node* node) {
+  StackSlotRepresentation rep = StackSlotRepresentationOf(node->op());
+  int slot = frame_->AllocateSpillSlot(rep.size());
+  OperandGenerator g(this);
+
+  Emit(kArchStackSlot, g.DefineAsRegister(node),
+       sequence()->AddImmediate(Constant(slot)), 0, nullptr);
+}
+
 void EmitLoad(InstructionSelector* selector, Node* node, InstructionCode opcode,
               ImmediateMode immediate_mode, MachineRepresentation rep,
               Node* output = nullptr) {
   Arm64OperandGenerator g(selector);
   Node* base = node->InputAt(0);
   Node* index = node->InputAt(1);
   InstructionOperand inputs[3];
   size_t input_count = 0;
   InstructionOperand outputs[1];
 
@@ skipping 2326 matching lines @@
 // static
 MachineOperatorBuilder::AlignmentRequirements
 InstructionSelector::AlignmentRequirements() {
   return MachineOperatorBuilder::AlignmentRequirements::
       FullUnalignedAccessSupport();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8