Revert of [turbofan] Add alignment parameter to StackSlot operator

src/compiler/raw-machine-assembler.h

Index: src/compiler/raw-machine-assembler.h
diff --git a/src/compiler/raw-machine-assembler.h b/src/compiler/raw-machine-assembler.h
index a82f9e079a246867530c013ba9c8d44ea683d588..f097903c8753eef6437dea165d592b8bf8bd2e44 100644
--- a/src/compiler/raw-machine-assembler.h
+++ b/src/compiler/raw-machine-assembler.h
@@ -84,8 +84,8 @@
   Node* Int32Constant(int32_t value) {
     return AddNode(common()->Int32Constant(value));
   }
-  Node* StackSlot(MachineRepresentation rep, int alignment = 0) {
-    return AddNode(machine()->StackSlot(rep, alignment));
+  Node* StackSlot(MachineRepresentation rep) {
+    return AddNode(machine()->StackSlot(rep));
   }
   Node* Int64Constant(int64_t value) {
     return AddNode(common()->Int64Constant(value));