Revert of [turbofan] Add alignment parameter to StackSlot operator

src/compiler/instruction-selector.cc

Index: src/compiler/instruction-selector.cc
diff --git a/src/compiler/instruction-selector.cc b/src/compiler/instruction-selector.cc
index e545d810a75823a79820a9797fa69b0421b17b81..42bb7b74d84a870d40f8979d9ba7c20ea091952b 100644
--- a/src/compiler/instruction-selector.cc
+++ b/src/compiler/instruction-selector.cc
@@ -1900,6 +1900,14 @@
   Emit(kArchLookupSwitch, 0, nullptr, input_count, inputs, 0, nullptr);
 }
 
+void InstructionSelector::VisitStackSlot(Node* node) {
+  int size = StackSlotSizeOf(node->op());
+  int slot = frame_->AllocateSpillSlot(size);
+  OperandGenerator g(this);
+
+  Emit(kArchStackSlot, g.DefineAsRegister(node),
+       sequence()->AddImmediate(Constant(slot)), 0, nullptr);
+}
 
 void InstructionSelector::VisitBitcastTaggedToWord(Node* node) {
   EmitIdentity(node);