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

src/compiler/x64/code-generator-x64.cc

Index: src/compiler/x64/code-generator-x64.cc
diff --git a/src/compiler/x64/code-generator-x64.cc b/src/compiler/x64/code-generator-x64.cc
index 295d3b3a37e79a64a99e52617dfac00da486491a..68aba0d371c523cdb0ee68b4a9999efecbceccde 100644
--- a/src/compiler/x64/code-generator-x64.cc
+++ b/src/compiler/x64/code-generator-x64.cc
@@ -738,18 +738,6 @@
                        MemoryChunk::kPointersFromHereAreInterestingMask,
                        not_zero, ool->entry());
       __ bind(ool->exit());
-      break;
-    }
-    case kArchStackSlot: {
-      FrameOffset offset =
-          frame_access_state()->GetFrameOffset(i.InputInt32(0));
-      Register base;
-      if (offset.from_stack_pointer()) {
-        base = rsp;
-      } else {
-        base = rbp;
-      }
-      __ leaq(i.OutputRegister(), Operand(base, offset.offset()));
       break;
     }
     case kX64Add32: