JIT: Update invalid opcache.jit INI value message to include "tracing…

…" and "function" values

`opcache.jit` accepts `tracing` and `function` as aliases, but they were not mentioned in the start-up INI warning message.
This updates the error message to include all possible values.

Closes GH-6490.

ext/opcache/jit/zend_jit.c

@@ -4129,7 +4129,7 @@ ZEND_EXT_API int zend_jit_config(zend_string *jit, int stage)
 	}
 
 failure:
-	zend_error(E_WARNING, "Invalid \"opcache.jit\" setting. Should be \"disable\", \"on\", \"off\" or 4-digit number");
+	zend_error(E_WARNING, "Invalid \"opcache.jit\" setting. Should be \"disable\", \"on\", \"off\", \"tracing\", \"function\" or 4-digit number");
 	JIT_G(enabled) = 0;
 	JIT_G(on) = 0;
 	return FAILURE;