[turbofan] Add the StackSlot operator to turbofan.

src/compiler/ppc/code-generator-ppc.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/ast/scopes.h"
 #include "src/compiler/code-generator-impl.h"
 #include "src/compiler/gap-resolver.h"
 #include "src/compiler/node-matchers.h"
@@ skipping 805 matching lines @@
       Register scratch1 = i.TempRegister(1);
       auto ool = new (zone()) OutOfLineRecordWrite(this, object, offset, value,
                                                    scratch0, scratch1, mode);
       __ StorePX(value, MemOperand(object, offset));
       __ CheckPageFlag(object, scratch0,
                        MemoryChunk::kPointersFromHereAreInterestingMask, ne,
                        ool->entry());
       __ bind(ool->exit());
       break;
     }
+    case kArchStackSlot: {
+      FrameOffset offset =
+          frame_access_state()->GetFrameOffset(i.InputInt32(0));
+      __ addi(i.OutputRegister(), offset.from_stack_pointer() ? sp : fp,
+              Operand(offset.offset()));
+      break;
+    }
     case kPPC_And:
       if (HasRegisterInput(instr, 1)) {
         __ and_(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1),
                 i.OutputRCBit());
       } else {
         __ andi(i.OutputRegister(), i.InputRegister(0), i.InputImmediate(1));
       }
       break;
     case kPPC_AndComplement:
       __ andc(i.OutputRegister(), i.InputRegister(0), i.InputRegister(1),
@@ skipping 1008 matching lines @@
       padding_size -= v8::internal::Assembler::kInstrSize;
     }
   }
 }
 
 #undef __
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8