Fix #80175: PHP8 RC1 - JIT Buffer not working

On Windows, `SUCCESSFULLY_REATTACHED` does not imply that the process
has already been properly initialized; thus we must not skip some setup
steps in `zend_jit_startup()`.

Closes GH-6268.

Author: cmb69

NEWS

@@ -9,6 +9,7 @@ PHP                                                                        NEWS
 - Opcache:
   . Fixed bug #80184 (Complex expression in while / if statements resolves to
     false incorrectly). (Nikita)
+  . Fixed bug #80175 (PHP8 RC1 - JIT Buffer not working). (cmb)
 
 - Reflection:
   . Fixed bug #80190 (ReflectionMethod::getReturnType() does not handle static

ext/opcache/ZendAccelerator.c

@@ -3000,7 +3000,7 @@ static zend_result accel_post_startup(void)
 				zend_accel_error(ACCEL_LOG_FATAL, "Failure to initialize shared memory structures - probably not enough shared memory.");
 				return SUCCESS;
 			case SUCCESSFULLY_REATTACHED:
-#ifdef HAVE_JIT
+#if defined(HAVE_JIT) && !defined(ZEND_WIN32)
 				reattached = 1;
 #endif
 				zend_shared_alloc_lock();