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

src/compiler/x87/code-generator-x87.cc

Index: src/compiler/x87/code-generator-x87.cc
diff --git a/src/compiler/x87/code-generator-x87.cc b/src/compiler/x87/code-generator-x87.cc
index 86859edf0e646a3d9c1d7add1da9a78d9c3bf1da..0ac411e431ecc002bed904c2b637f6cde2eea909 100644
--- a/src/compiler/x87/code-generator-x87.cc
+++ b/src/compiler/x87/code-generator-x87.cc
@@ -585,18 +585,6 @@
                        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 = esp;
-      } else {
-        base = ebp;
-      }
-      __ lea(i.OutputRegister(), Operand(base, offset.offset()));
       break;
     }
     case kX87Add: