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

src/compiler/machine-operator.h

 // Copyright 2013 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_MACHINE_OPERATOR_H_
 #define V8_COMPILER_MACHINE_OPERATOR_H_
 
 #include "src/base/compiler-specific.h"
 #include "src/base/flags.h"
 #include "src/globals.h"
@@ skipping 75 matching lines @@
 typedef MachineType CheckedLoadRepresentation;
 
 CheckedLoadRepresentation CheckedLoadRepresentationOf(Operator const*);
 
 
 // A CheckedStore needs a MachineType.
 typedef MachineRepresentation CheckedStoreRepresentation;
 
 CheckedStoreRepresentation CheckedStoreRepresentationOf(Operator const*);
 
-int StackSlotSizeOf(Operator const* op);
+class StackSlotRepresentation final {
+ public:
+  StackSlotRepresentation(int size, int alignment)
+      : size_(size), alignment_(alignment) {}
+
+  int size() const { return size_; }
+  int alignment() const { return alignment_; }
+
+ private:
+  int size_;
+  int alignment_;
+};
+
+V8_EXPORT_PRIVATE bool operator==(StackSlotRepresentation,
+                                  StackSlotRepresentation);
+bool operator!=(StackSlotRepresentation, StackSlotRepresentation);
+
+size_t hash_value(StackSlotRepresentation);
+
+V8_EXPORT_PRIVATE std::ostream& operator<<(std::ostream&,
+                                           StackSlotRepresentation);
+
+StackSlotRepresentation const& StackSlotRepresentationOf(Operator const* op);
 
 MachineRepresentation AtomicStoreRepresentationOf(Operator const* op);
 
 MachineType AtomicOpRepresentationOf(Operator const* op);
 
 // Interface for building machine-level operators. These operators are
 // machine-level but machine-independent and thus define a language suitable
 // for generating code to run on architectures such as ia32, x64, arm, etc.
 class V8_EXPORT_PRIVATE MachineOperatorBuilder final
     : public NON_EXPORTED_BASE(ZoneObject) {
@@ skipping 485 matching lines @@
   // store [base + index], value
   const Operator* Store(StoreRepresentation rep);
   const Operator* ProtectedStore(MachineRepresentation rep);
 
   // unaligned load [base + index]
   const Operator* UnalignedLoad(UnalignedLoadRepresentation rep);
 
   // unaligned store [base + index], value
   const Operator* UnalignedStore(UnalignedStoreRepresentation rep);
 
-  const Operator* StackSlot(int size);
-  const Operator* StackSlot(MachineRepresentation rep);
+  const Operator* StackSlot(int size, int alignment = 0);
+  const Operator* StackSlot(MachineRepresentation rep, int alignment = 0);
 
   // Access to the machine stack.
   const Operator* LoadStackPointer();
   const Operator* LoadFramePointer();
   const Operator* LoadParentFramePointer();
 
   // checked-load heap, index, length
   const Operator* CheckedLoad(CheckedLoadRepresentation);
   // checked-store heap, index, length, value
   const Operator* CheckedStore(CheckedStoreRepresentation);
@@ skipping 75 matching lines @@
 };
 
 
 DEFINE_OPERATORS_FOR_FLAGS(MachineOperatorBuilder::Flags)
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_MACHINE_OPERATOR_H_