Do not add extra argument for new.target

src/arm/builtins-arm.cc

 // Copyright 2012 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_ARM
 
 #include "src/codegen.h"
 #include "src/debug.h"
@@ skipping 764 matching lines @@
     // sp[2]: number of arguments (smi-tagged)
     Label loop, entry;
     __ b(&entry);
     __ bind(&loop);
     __ ldr(ip, MemOperand(r2, r4, LSL, kPointerSizeLog2 - 1));
     __ push(ip);
     __ bind(&entry);
     __ sub(r4, r4, Operand(2), SetCC);
     __ b(ge, &loop);
 
-    __ add(r0, r0, Operand(1));
-
     // Handle step in.
     Label skip_step_in;
     ExternalReference debug_step_in_fp =
         ExternalReference::debug_step_in_fp_address(masm->isolate());
     __ mov(r2, Operand(debug_step_in_fp));
     __ ldr(r2, MemOperand(r2));
     __ tst(r2, r2);
     __ b(eq, &skip_step_in);
 
     __ Push(r0);
     __ Push(r1);
     __ Push(r1);
     __ CallRuntime(Runtime::kHandleStepInForDerivedConstructors, 1);
     __ Pop(r1);
     __ Pop(r0);
 
     __ bind(&skip_step_in);
 
     // Call the function.
     // r0: number of arguments
     // r1: constructor function
     ParameterCount actual(r0);
     __ InvokeFunction(r1, actual, CALL_FUNCTION, NullCallWrapper());
 
     // Restore context from the frame.
     // r0: result
     // sp[0]: number of arguments (smi-tagged)
     __ ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
-    __ ldr(r1, MemOperand(sp, 0));
+    // Get arguments count, skipping over new.target.
+    __ ldr(r1, MemOperand(sp, kPointerSize));
 
     // Leave construct frame.
   }
 
   __ add(sp, sp, Operand(r1, LSL, kPointerSizeLog2 - 1));
   __ add(sp, sp, Operand(kPointerSize));
   __ Jump(lr);
 }
 
 
@@ skipping 985 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM