[turbofan] Make new.target explicit in JSCallDescriptor.

src/ia32/macro-assembler-ia32.h

Index: src/ia32/macro-assembler-ia32.h
diff --git a/src/ia32/macro-assembler-ia32.h b/src/ia32/macro-assembler-ia32.h
index 51027ea78c063652970a2936cfc90301e2c23cb3..55ba8d447f85c3054ffce577d6addb5055741c53 100644
--- a/src/ia32/macro-assembler-ia32.h
+++ b/src/ia32/macro-assembler-ia32.h
@@ -23,6 +23,7 @@ const Register kInterpreterRegisterFileRegister = {Register::kCode_edx};
 const Register kInterpreterBytecodeOffsetRegister = {Register::kCode_ecx};
 const Register kInterpreterBytecodeArrayRegister = {Register::kCode_edi};
 const Register kJavaScriptCallArgCountRegister = {Register::kCode_eax};
+const Register kJavaScriptCallNewTargetRegister = {Register::kCode_edx};
 const Register kRuntimeCallFunctionRegister = {Register::kCode_ebx};
 const Register kRuntimeCallArgCountRegister = {Register::kCode_eax};