Switch CallConstructStub to take new.target in register.

src/ia32/builtins-ia32.cc

Index: src/ia32/builtins-ia32.cc
diff --git a/src/ia32/builtins-ia32.cc b/src/ia32/builtins-ia32.cc
index 5cbecc22bafd2aa8099bb8ab2a4e08da8a056bdf..3a85089d47bc19a6670a601fadd8a32e5afaad2b 100644
--- a/src/ia32/builtins-ia32.cc
+++ b/src/ia32/builtins-ia32.cc
@@ -1172,8 +1172,7 @@ static void Generate_ConstructHelper(MacroAssembler* masm) {
     const int kIndexOffset = kLimitOffset - 1 * kPointerSize;
     __ Push(eax);  // limit
     __ push(Immediate(0));  // index
-    // Push newTarget and callee functions
-    __ push(Operand(ebp, kNewTargetOffset));
+    // Push the constructor function as callee.
     __ push(Operand(ebp, kFunctionOffset));
 
     // Loop over the arguments array, pushing each value to the stack
@@ -1183,13 +1182,12 @@ static void Generate_ConstructHelper(MacroAssembler* masm) {
     // Use undefined feedback vector
     __ LoadRoot(ebx, Heap::kUndefinedValueRootIndex);
     __ mov(edi, Operand(ebp, kFunctionOffset));
+    __ mov(ecx, Operand(ebp, 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