Revert of [turbofan] Add the StackSlot operator to turbofan.

src/compiler/arm64/code-generator-arm64.cc

Index: src/compiler/arm64/code-generator-arm64.cc
diff --git a/src/compiler/arm64/code-generator-arm64.cc b/src/compiler/arm64/code-generator-arm64.cc
index a038c7155d44b5a15a4d92e2882d874696f13978..749f581f696d50953de8ee75c3129082fa9838c9 100644
--- a/src/compiler/arm64/code-generator-arm64.cc
+++ b/src/compiler/arm64/code-generator-arm64.cc
@@ -646,18 +646,6 @@
       __ Bind(ool->exit());
       break;
     }
-    case kArchStackSlot: {
-      FrameOffset offset =
-          frame_access_state()->GetFrameOffset(i.InputInt32(0));
-      Register base;
-      if (offset.from_stack_pointer()) {
-        base = __ StackPointer();
-      } else {
-        base = fp;
-      }
-      __ Add(i.OutputRegister(0), base, Operand(offset.offset()));
-      break;
-    }
     case kArm64Float32RoundDown:
       __ Frintm(i.OutputFloat32Register(), i.InputFloat32Register(0));
       break;