Switch CallConstructStub to take new.target in register.

src/x64/builtins-x64.cc

Index: src/x64/builtins-x64.cc
diff --git a/src/x64/builtins-x64.cc b/src/x64/builtins-x64.cc
index c59d3ba78fbd557467904af73bba72810fb9521f..7873aa2a3dbc993634253958687b1a8bb55ea6b2 100644
--- a/src/x64/builtins-x64.cc
+++ b/src/x64/builtins-x64.cc
@@ -1236,8 +1236,7 @@ static void Generate_ConstructHelper(MacroAssembler* masm) {
     const int kIndexOffset = kLimitOffset - 1 * kPointerSize;
     __ Push(rax);  // limit
     __ Push(Immediate(0));  // index
-    // Push newTarget and callee functions
-    __ Push(Operand(rbp, kNewTargetOffset));
+    // Push the constructor function as callee.
     __ Push(Operand(rbp, kFunctionOffset));
 
     // Loop over the arguments array, pushing each value to the stack
@@ -1247,13 +1246,12 @@ static void Generate_ConstructHelper(MacroAssembler* masm) {
     // Use undefined feedback vector
     __ LoadRoot(rbx, Heap::kUndefinedValueRootIndex);
     __ movp(rdi, Operand(rbp, kFunctionOffset));
+    __ movp(rcx, Operand(rbp, kNewTargetOffset));
 
     // Call the function.
     CallConstructStub stub(masm->isolate(), SUPER_CONSTRUCTOR_CALL);
     __ call(stub.GetCode(), RelocInfo::CONSTRUCT_CALL);
 
-    __ Drop(1);
-
     // Leave internal frame.
   }
   // remove this, target, arguments and newTarget