[turbofan] Rewrite ToObject as TurboFan stub.

src/builtins/s390/builtins-s390.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_S390
 
 #include "src/codegen.h"
 #include "src/debug/debug.h"
 #include "src/deoptimizer.h"
 #include "src/full-codegen/full-codegen.h"
@@ skipping 2453 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(r2);
         __ Push(r2, r3);
         __ LoadRR(r2, r5);
+        __ Push(cp);
         ToObjectStub stub(masm->isolate());
         __ CallStub(&stub);
+        __ Pop(cp);
         __ LoadRR(r5, r2);
         __ Pop(r2, r3);
         __ SmiUntag(r2);
       }
       __ LoadP(r4, FieldMemOperand(r3, JSFunction::kSharedFunctionInfoOffset));
       __ bind(&convert_receiver);
     }
     __ ShiftLeftP(r6, r2, Operand(kPointerSizeLog2));
     __ StoreP(r5, MemOperand(sp, r6));
   }
@@ skipping 532 matching lines @@
     __ bkpt(0);
   }
 }
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_S390