[turbofan] Create ExplicitOperands to specify operands without virtual registers

src/compiler/code-generator.cc

Index: src/compiler/code-generator.cc
diff --git a/src/compiler/code-generator.cc b/src/compiler/code-generator.cc
index c65dd65ab023e121c8dcfc19bb0789dbc85541e6..0fb828a076dc35592eb6ca1d1b574dbde2a98181 100644
--- a/src/compiler/code-generator.cc
+++ b/src/compiler/code-generator.cc
@@ -220,14 +220,14 @@ void CodeGenerator::RecordSafepoint(ReferenceMap* references,
       frame()->GetTotalFrameSlotCount() - frame()->GetSpillSlotCount();
   for (auto& operand : references->reference_operands()) {
     if (operand.IsStackSlot()) {
-      int index = StackSlotOperand::cast(operand).index();
+      int index = LocationOperand::cast(operand).index();
       DCHECK(index >= 0);
       // Safepoint table indices are 0-based from the beginning of the spill
       // slot area, adjust appropriately.
       index -= stackSlotToSpillSlotDelta;
       safepoint.DefinePointerSlot(index, zone());
     } else if (operand.IsRegister() && (kind & Safepoint::kWithRegisters)) {
-      Register reg = RegisterOperand::cast(operand).GetRegister();
+      Register reg = LocationOperand::cast(operand).GetRegister();
       safepoint.DefinePointerRegister(reg, zone());
     }
   }
@@ -589,21 +589,20 @@ void CodeGenerator::AddTranslationForOperand(Translation* translation,
                                              MachineType type) {
   if (op->IsStackSlot()) {
     if (type == kMachBool || type == kRepBit) {
-      translation->StoreBoolStackSlot(StackSlotOperand::cast(op)->index());
+      translation->StoreBoolStackSlot(LocationOperand::cast(op)->index());
     } else if (type == kMachInt32 || type == kMachInt8 || type == kMachInt16) {
-      translation->StoreInt32StackSlot(StackSlotOperand::cast(op)->index());
+      translation->StoreInt32StackSlot(LocationOperand::cast(op)->index());
     } else if (type == kMachUint32 || type == kMachUint16 ||
                type == kMachUint8) {
-      translation->StoreUint32StackSlot(StackSlotOperand::cast(op)->index());
+      translation->StoreUint32StackSlot(LocationOperand::cast(op)->index());
     } else if ((type & kRepMask) == kRepTagged) {
-      translation->StoreStackSlot(StackSlotOperand::cast(op)->index());
+      translation->StoreStackSlot(LocationOperand::cast(op)->index());
     } else {
       CHECK(false);
     }
   } else if (op->IsDoubleStackSlot()) {
     DCHECK((type & (kRepFloat32 | kRepFloat64)) != 0);
-    translation->StoreDoubleStackSlot(
-        DoubleStackSlotOperand::cast(op)->index());
+    translation->StoreDoubleStackSlot(LocationOperand::cast(op)->index());
   } else if (op->IsRegister()) {
     InstructionOperandConverter converter(this, instr);
     if (type == kMachBool || type == kRepBit) {