Revert "Merge branch 'PHP-8.3' into PHP-8.4"

This reverts commit ae62779386, reversing
changes made to 19e685ecc4.

This was a bad merge; I'll have a look shortly.

NEWS

@@ -1,11 +1,5 @@
 PHP                                                                        NEWS
 |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
-?? ??? ????, PHP 8.4.2
-
-- Opcache:
-  . Fixed bug GH-16851 (JIT_G(enabled) not set correctly on other threads).
-    (dktapps)
-
 21 Nov 2024, PHP 8.4.1
 
 - BcMath:

ext/opcache/ZendAccelerator.c

@@ -3282,8 +3282,6 @@ static zend_result accel_post_startup(void)
 				zend_accel_error_noreturn(ACCEL_LOG_FATAL, "Could not enable JIT: could not use reserved buffer!");
 			} else {
 				zend_jit_startup(ZSMMG(reserved), jit_size, reattached);
-			} else {
-				zend_jit_startup_ok = true;
 			}
 		}
 #endif

ext/opcache/jit/zend_jit.c

@@ -69,8 +69,6 @@ zend_jit_globals jit_globals;
 #define JIT_STUB_PREFIX "JIT$$"
 #define TRACE_PREFIX    "TRACE-"
 
-bool zend_jit_startup_ok = false;
-
 zend_ulong zend_jit_profile_counter = 0;
 int zend_jit_profile_counter_rid = -1;
 
@@ -3636,13 +3634,6 @@ static void zend_jit_reset_counters(void)
 
 void zend_jit_activate(void)
 {
-#ifdef ZTS
-	if (!zend_jit_startup_ok) {
-		JIT_G(enabled) = 0;
-		JIT_G(on) = 0;
-		return;
-	}
-#endif
 	zend_jit_profile_counter = 0;
 	if (JIT_G(on)) {
 		if (JIT_G(trigger) == ZEND_JIT_ON_HOT_COUNTERS) {

ext/opcache/jit/zend_jit.h

@@ -100,8 +100,6 @@ typedef struct _zend_jit_trace_rec zend_jit_trace_rec;
 typedef struct _zend_jit_trace_stack_frame zend_jit_trace_stack_frame;
 typedef struct _sym_node zend_sym_node;
 
-extern bool zend_jit_startup_ok;
-
 typedef struct _zend_jit_globals {
 	bool enabled;
 	bool on;