Do not add extra argument for new.target

src/arm64/builtins-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/codegen.h"
 #include "src/debug.h"
@@ skipping 713 matching lines @@
   {
     FrameScope frame_scope(masm, StackFrame::CONSTRUCT);
     __ Mov(x4, x0);
     __ SmiTag(x4);
     __ LoadRoot(x10, Heap::kTheHoleValueRootIndex);
     __ Push(x4, x3, x10);
     // sp[0]: number of arguments
     // sp[1]: new.target
     // sp[2]: receiver (the hole)
 
-
     // Set up pointer to last argument.
     __ Add(x2, fp, StandardFrameConstants::kCallerSPOffset);
 
     // Copy arguments and receiver to the expression stack.
     // Copy 2 values every loop to use ldp/stp.
     // x0: number of arguments
     // x1: constructor function
     // x2: address of last argument (caller sp)
     // jssp[0]: receiver
     // jssp[1]: new.target
     // jssp[2]: number of arguments (smi-tagged)
     // Compute the start address of the copy in x4.
     __ Add(x4, x2, Operand(x0, LSL, kPointerSizeLog2));
     Label loop, entry, done_copying_arguments;
     __ B(&entry);
     __ Bind(&loop);
     __ Ldp(x10, x11, MemOperand(x4, -2 * kPointerSize, PreIndex));
     __ Push(x11, x10);
     __ Bind(&entry);
     __ Cmp(x4, x2);
     __ B(gt, &loop);
     // Because we copied values 2 by 2 we may have copied one extra value.
     // Drop it if that is the case.
     __ B(eq, &done_copying_arguments);
     __ Drop(1);
     __ Bind(&done_copying_arguments);
 
-    __ Add(x0, x0, Operand(1));  // new.target
-
     // Handle step in.
     Label skip_step_in;
     ExternalReference debug_step_in_fp =
         ExternalReference::debug_step_in_fp_address(masm->isolate());
     __ Mov(x2, Operand(debug_step_in_fp));
     __ Ldr(x2, MemOperand(x2));
     __ Cbz(x2, &skip_step_in);
 
     __ Push(x0, x1, x1);
     __ CallRuntime(Runtime::kHandleStepInForDerivedConstructors, 1);
     __ Pop(x1, x0);
 
     __ bind(&skip_step_in);
 
     // Call the function.
     // x0: number of arguments
     // x1: constructor function
     ParameterCount actual(x0);
     __ InvokeFunction(x1, actual, CALL_FUNCTION, NullCallWrapper());
 
 
     // Restore the context from the frame.
     // x0: result
     // jssp[0]: number of arguments (smi-tagged)
     __ Ldr(cp, MemOperand(fp, StandardFrameConstants::kContextOffset));
 
-    // Load number of arguments (smi).
-    __ Peek(x1, 0);
+    // Load number of arguments (smi), skipping over new.target.
+    __ Peek(x1, kPointerSize);
 
     // Leave construct frame
   }
 
   __ DropBySMI(x1);
   __ Drop(1);
   __ Ret();
 }
 
 
@@ skipping 1038 matching lines @@
   }
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM