Do not run autoloader when resolving unqualified call

Author: Girgias

Zend/tests/autoloading/function/namespaces_basic.phpt renamed to Zend/tests/autoloading/function/global_fallback001.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Fallback to global function should not trigger autoloading.
+--FILE--
+<?php
+namespace {
+    function loader($name) {
+        echo $name, \PHP_EOL;
+    }
+
+    autoload_register_function('loader');
+}
+
+namespace bar {
+	var_dump('Hello');
+}
+?>
+--EXPECT--
+string(5) "Hello"

Zend/tests/autoloading/function/global_fallback002.phpt

@@ -3849,13 +3849,13 @@ ZEND_VM_HOT_HANDLER(69, ZEND_INIT_NS_FCALL_BY_NAME, ANY, CONST, NUM|CACHE_SLOT)
 	if (UNEXPECTED(fbc == NULL)) {
 		zval *function_name = (zval *)RT_CONSTANT(opline, opline->op2);
 		/* Fetch lowercase name stored in the next literal slot */
-		fbc = zend_lookup_function_ex(Z_STR_P(function_name), Z_STR_P(function_name+1), /* use_autoload */ true);
+		fbc = zend_lookup_function_ex(Z_STR_P(function_name), Z_STR_P(function_name+1), /* use_autoload */ false);
 		if (UNEXPECTED(fbc == NULL)) {
 			if (UNEXPECTED(EG(exception))) {
 				HANDLE_EXCEPTION();
 			}
 			/* Fallback onto global namespace, by fetching the unqualified lowercase name stored in the second literal slot */
-			fbc = zend_lookup_function_ex(Z_STR_P(function_name+2), Z_STR_P(function_name+2), /* use_autoload */ true);
+			fbc = zend_lookup_function_ex(Z_STR_P(function_name+2), Z_STR_P(function_name+2), /* use_autoload */ false);
 			if (fbc == NULL) {
 				if (UNEXPECTED(EG(exception))) {
 					HANDLE_EXCEPTION();

Zend/zend_vm_def.h

@@ -3656,13 +3656,13 @@ static ZEND_VM_HOT ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_INIT_NS_FCALL_BY_N
 	if (UNEXPECTED(fbc == NULL)) {
 		zval *function_name = (zval *)RT_CONSTANT(opline, opline->op2);
 		/* Fetch lowercase name stored in the next literal slot */
-		fbc = zend_lookup_function_ex(Z_STR_P(function_name), Z_STR_P(function_name+1), /* use_autoload */ true);
+		fbc = zend_lookup_function_ex(Z_STR_P(function_name), Z_STR_P(function_name+1), /* use_autoload */ false);
 		if (UNEXPECTED(fbc == NULL)) {
 			if (UNEXPECTED(EG(exception))) {
 				HANDLE_EXCEPTION();
 			}
 			/* Fallback onto global namespace, by fetching the unqualified lowercase name stored in the second literal slot */
-			fbc = zend_lookup_function_ex(Z_STR_P(function_name+2), Z_STR_P(function_name+2), /* use_autoload */ true);
+			fbc = zend_lookup_function_ex(Z_STR_P(function_name+2), Z_STR_P(function_name+2), /* use_autoload */ false);
 			if (fbc == NULL) {
 				if (UNEXPECTED(EG(exception))) {
 					HANDLE_EXCEPTION();