Fix GH-16577: EG(strtod_state).freelist leaks with opcache.preload

ext/opcache/ZendAccelerator.c

@@ -4462,6 +4462,12 @@ static zend_result accel_preload(const char *config, bool in_child)
 		/* Release stored values to avoid dangling pointers */
 		zend_shutdown_executor_values(/* fast_shutdown */ false);
 
+		/* On ZTS we execute `executor_globals_ctor` which reset the freelist and p5s pointers, while on NTS we don't.
+		 * We have to clean up the memory before the actual request takes place to avoid a memory leak. */
+#ifdef ZTS
+		zend_shutdown_strtod();
+#endif
+
 		/* We don't want to preload constants.
 		 * Check that  zend_shutdown_executor_values() also destroys constants. */
 		ZEND_ASSERT(zend_hash_num_elements(EG(zend_constants)) == EG(persistent_constants_count));

ext/opcache/tests/gh16577.inc

@@ -0,0 +1,2 @@
+<?php
+var_dump(1.5);

ext/opcache/tests/gh16577.phpt

@@ -0,0 +1,20 @@
+--TEST--
+GH-16577 (EG(strtod_state).freelist leaks with opcache.preload)
+--INI--
+opcache.enable=1
+opcache.enable_cli=1
+opcache.optimization_level=-1
+opcache.preload={PWD}/gh16577.inc
+--EXTENSIONS--
+opcache
+--SKIPIF--
+<?php
+if (PHP_OS_FAMILY == 'Windows') die('skip Preloading is not supported on Windows');
+?>
+--FILE--
+<?php
+echo "Done\n";
+?>
+--EXPECT--
+float(1.5)
+Done