Add test that properly show cases the need for pining the function

If everything is in the same file the function cache will already have resolved the function pointer and not call the autoloader.
However, this doesn't happen when the calls happen in different files.

Author: Girgias

Zend/tests/autoloading/function/global_fallback_doesnt_repeat_autoloading_file1.inc

@@ -0,0 +1,8 @@
+<?php
+namespace bar;
+
+foo();
+
+for ($i = 0; $i < 3; $i += 1) {
+    foo();
+}

Zend/tests/autoloading/function/global_fallback_doesnt_repeat_autoloading_file2.inc

@@ -0,0 +1,5 @@
+<?php
+
+namespace bar;
+
+foo();

Zend/tests/autoloading/function/global_fallback_doesnt_repeat_autoloading_seperate_files_inclusion.phpt

@@ -0,0 +1,26 @@
+--TEST--
+Fallback to global function should trigger autoloading only once per namespace, seperate files case.
+--FILE--
+<?php
+
+function loader($name) {
+    echo "function loader called with $name\n";
+}
+
+autoload_register_function('loader');
+
+function foo() {
+    echo "I am foo in global namespace.\n";
+}
+
+include __DIR__ . DIRECTORY_SEPARATOR . 'global_fallback_doesnt_repeat_autoloading_file1.inc';
+include __DIR__ . DIRECTORY_SEPARATOR . 'global_fallback_doesnt_repeat_autoloading_file2.inc';
+
+?>
+--EXPECT--
+function loader called with bar\foo
+I am foo in global namespace.
+I am foo in global namespace.
+I am foo in global namespace.
+I am foo in global namespace.
+I am foo in global namespace.