PPC: Handle the case when derived constructor is [[Call]]ed with 0 args.

src/ppc/code-stubs-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/v8.h"
 
 #if V8_TARGET_ARCH_PPC
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 1962 matching lines @@
   __ beq(&adaptor_frame);
 
   // Get the length from the frame.
   __ LoadP(r4, MemOperand(sp, 0));
   __ b(&try_allocate);
 
   // Patch the arguments.length and the parameters pointer.
   __ bind(&adaptor_frame);
   __ LoadP(r4, MemOperand(r5, ArgumentsAdaptorFrameConstants::kLengthOffset));
   if (has_new_target()) {
+    __ CmpSmiLiteral(r4, Smi::FromInt(0), r0);
+    Label skip_decrement;
+    __ beq(&skip_decrement);
     // Subtract 1 from smi-tagged arguments count.
     __ SubSmiLiteral(r4, r4, Smi::FromInt(1), r0);
+    __ bind(&skip_decrement);
   }
   __ StoreP(r4, MemOperand(sp, 0));
   __ SmiToPtrArrayOffset(r6, r4);
   __ add(r6, r5, r6);
   __ addi(r6, r6, Operand(StandardFrameConstants::kCallerSPOffset));
   __ StoreP(r6, MemOperand(sp, 1 * kPointerSize));
 
   // Try the new space allocation. Start out with computing the size
   // of the arguments object and the elements array in words.
   Label add_arguments_object;
@@ skipping 3589 matching lines @@
                            kStackUnwindSpace, NULL,
                            MemOperand(fp, 6 * kPointerSize), NULL);
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_PPC