[turbofan] Add the StackSlot operator to turbofan.

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

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/code-generator.h"
 
 #include "src/arm/macro-assembler-arm.h"
 #include "src/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
@@ skipping 517 matching lines @@
       Register scratch1 = i.TempRegister(1);
       auto ool = new (zone()) OutOfLineRecordWrite(this, object, index, value,
                                                    scratch0, scratch1, mode);
       __ str(value, MemOperand(object, index));
       __ CheckPageFlag(object, scratch0,
                        MemoryChunk::kPointersFromHereAreInterestingMask, ne,
                        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 = sp;
+      } else {
+        base = fp;
+      }
+      __ add(i.OutputRegister(0), base, Operand(offset.offset()));
+      break;
+    }
     case kArmAdd:
       __ add(i.OutputRegister(), i.InputRegister(0), i.InputOperand2(1),
              i.OutputSBit());
       break;
     case kArmAnd:
       __ and_(i.OutputRegister(), i.InputRegister(0), i.InputOperand2(1),
               i.OutputSBit());
       break;
     case kArmBic:
       __ bic(i.OutputRegister(), i.InputRegister(0), i.InputOperand2(1),
@@ skipping 843 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8