[turbofan] Rewrite ToObject as TurboFan stub.

src/builtins/ppc/builtins-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.
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 2439 matching lines @@
       }
       __ bind(&convert_to_object);
       {
         // Convert receiver using ToObject.
         // TODO(bmeurer): Inline the allocation here to avoid building the frame
         // in the fast case? (fall back to AllocateInNewSpace?)
         FrameAndConstantPoolScope scope(masm, StackFrame::INTERNAL);
         __ SmiTag(r3);
         __ Push(r3, r4);
         __ mr(r3, r6);
+        __ Push(cp);
         ToObjectStub stub(masm->isolate());
         __ CallStub(&stub);
+        __ Pop(cp);
         __ mr(r6, r3);
         __ Pop(r3, r4);
         __ SmiUntag(r3);
       }
       __ LoadP(r5, FieldMemOperand(r4, JSFunction::kSharedFunctionInfoOffset));
       __ bind(&convert_receiver);
     }
     __ ShiftLeftImm(r7, r3, Operand(kPointerSizeLog2));
     __ StorePX(r6, MemOperand(sp, r7));
   }
@@ skipping 530 matching lines @@
     __ CallRuntime(Runtime::kThrowStackOverflow);
     __ bkpt(0);
   }
 }
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_PPC