Fix passing of undef var to named arg

This needs to use the previously computed argument target.

Author: nikic

Zend/tests/named_params/undef_var.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Passing undefined variabled to named arg
+--FILE--
+<?php
+
+function func1($arg) { var_dump($arg); }
+func1(arg: $undef);
+func2(arg: $undef);
+function func2($arg) { var_dump($arg); }
+
+?>
+--EXPECTF--
+Warning: Undefined variable $undef in %s on line %d
+NULL
+
+Warning: Undefined variable $undef in %s on line %d
+NULL

Zend/zend_vm_def.h

@@ -4855,7 +4855,6 @@ ZEND_VM_C_LABEL(send_var_by_ref):
 	if (OP1_TYPE == IS_CV && UNEXPECTED(Z_TYPE_INFO_P(varptr) == IS_UNDEF)) {
 		SAVE_OPLINE();
 		ZVAL_UNDEFINED_OP1();
-		arg = ZEND_CALL_VAR(EX(call), opline->result.var);
 		ZVAL_NULL(arg);
 		ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 	}

Zend/zend_vm_execute.h

@@ -23363,7 +23363,6 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_VAR_EX_SPEC_VAR_CONST_HAN
 	if (IS_VAR == IS_CV && UNEXPECTED(Z_TYPE_INFO_P(varptr) == IS_UNDEF)) {
 		SAVE_OPLINE();
 		ZVAL_UNDEFINED_OP1();
-		arg = ZEND_CALL_VAR(EX(call), opline->result.var);
 		ZVAL_NULL(arg);
 		ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 	}
@@ -27309,7 +27308,6 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_VAR_EX_SPEC_VAR_UNUSED_HA
 	if (IS_VAR == IS_CV && UNEXPECTED(Z_TYPE_INFO_P(varptr) == IS_UNDEF)) {
 		SAVE_OPLINE();
 		ZVAL_UNDEFINED_OP1();
-		arg = ZEND_CALL_VAR(EX(call), opline->result.var);
 		ZVAL_NULL(arg);
 		ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 	}
@@ -27376,7 +27374,6 @@ static ZEND_VM_HOT ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_VAR_EX_SPEC_V
 	if (IS_VAR == IS_CV && UNEXPECTED(Z_TYPE_INFO_P(varptr) == IS_UNDEF)) {
 		SAVE_OPLINE();
 		ZVAL_UNDEFINED_OP1();
-		arg = ZEND_CALL_VAR(EX(call), opline->result.var);
 		ZVAL_NULL(arg);
 		ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 	}
@@ -40895,7 +40892,6 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_VAR_EX_SPEC_CV_CONST_HAND
 	if (IS_CV == IS_CV && UNEXPECTED(Z_TYPE_INFO_P(varptr) == IS_UNDEF)) {
 		SAVE_OPLINE();
 		ZVAL_UNDEFINED_OP1();
-		arg = ZEND_CALL_VAR(EX(call), opline->result.var);
 		ZVAL_NULL(arg);
 		ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 	}
@@ -46015,7 +46011,6 @@ static ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_VAR_EX_SPEC_CV_UNUSED_HAN
 	if (IS_CV == IS_CV && UNEXPECTED(Z_TYPE_INFO_P(varptr) == IS_UNDEF)) {
 		SAVE_OPLINE();
 		ZVAL_UNDEFINED_OP1();
-		arg = ZEND_CALL_VAR(EX(call), opline->result.var);
 		ZVAL_NULL(arg);
 		ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 	}
@@ -46081,7 +46076,6 @@ static ZEND_VM_HOT ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_SEND_VAR_EX_SPEC_C
 	if (IS_CV == IS_CV && UNEXPECTED(Z_TYPE_INFO_P(varptr) == IS_UNDEF)) {
 		SAVE_OPLINE();
 		ZVAL_UNDEFINED_OP1();
-		arg = ZEND_CALL_VAR(EX(call), opline->result.var);
 		ZVAL_NULL(arg);
 		ZEND_VM_NEXT_OPCODE_CHECK_EXCEPTION();
 	}