Fix #79008: General performance regression with PHP 7.4 on Windows

We no longer try to retrieve the filename of a given stream when
fstat'ing, because this is very slow.  Since we neither didn't do that
in PHP 7.3 and earlier, we regard this as sensible trade-off.

Author: cmb69

NEWS

@@ -12,6 +12,8 @@ PHP                                                                        NEWS
     "static"). (Nikita)
   . Fixed bug #78999 (Cycle leak when using function result as temporary).
     (Dmitry)
+  . Fixed bug #79008 (General performance regression with PHP 7.4 on Windows).
+    (cmb)
 
 - Fileinfo:
   . Fixed bug #74170 (locale information change after mime_content_type).

win32/ioutil.c

@@ -867,16 +867,6 @@ static int php_win32_ioutil_fstat_int(HANDLE h, php_win32_ioutil_stat_t *buf, co
 
 	data = !dp ? &d : dp;
 
-	if (!pathw) {
-		pathw_len = GetFinalPathNameByHandleW(h, mypath, MAXPATHLEN, VOLUME_NAME_DOS);
-		if (pathw_len >= MAXPATHLEN || pathw_len == 0) {
-			pathw_len = 0;
-			pathw = NULL;
-		} else {
-			pathw = mypath;
-		}
-	}
-
 	if(!GetFileInformationByHandle(h, data)) {
 		if (INVALID_HANDLE_VALUE != h) {
 			/* Perhaps it's a fileless stream like stdio, reuse the normal stat info. */