Do compile-time evaluation of locale-independent case conversion

https://wiki.php.net/rfc/strtolower-ascii means that these functions no longer
depend on the current locale in php 8.2. Before that, this was unsafe to
evaluate at compile time.

Followup to phpGH-7506

Author: TysonAndre

Zend/Optimizer/sccp.c

@@ -802,8 +802,10 @@ static inline zend_result ct_eval_array_key_exists(zval *result, zval *op1, zval
 static bool can_ct_eval_func_call(zend_string *name, uint32_t num_args, zval **args) {
 	/* Functions in this list must always produce the same result for the same arguments,
 	 * and have no dependence on global state (such as locales). It is okay if they throw
-	 * or warn on invalid arguments, as we detect this and will discard the evaluation result. */
+	 * or warn on invalid arguments, as we detect this and will discard the evaluation result.
+	 * In PHP 8.2, many functions stopped depending on locales due to https://wiki.php.net/rfc/strtolower-ascii */
 	if (false
+		|| zend_string_equals_literal(name, "array_change_key_case")
 		|| zend_string_equals_literal(name, "array_diff")
 		|| zend_string_equals_literal(name, "array_diff_assoc")
 		|| zend_string_equals_literal(name, "array_diff_key")
@@ -824,6 +826,7 @@ static bool can_ct_eval_func_call(zend_string *name, uint32_t num_args, zval **a
 		|| zend_string_equals_literal(name, "dirname")
 #endif
 		|| zend_string_equals_literal(name, "explode")
+		|| zend_string_equals_literal(name, "lcfirst")
 		|| zend_string_equals_literal(name, "imagetypes")
 		|| zend_string_equals_literal(name, "in_array")
 		|| zend_string_equals_literal(name, "implode")
@@ -839,13 +842,21 @@ static bool can_ct_eval_func_call(zend_string *name, uint32_t num_args, zval **a
 		|| zend_string_equals_literal(name, "serialize")
 		|| zend_string_equals_literal(name, "str_contains")
 		|| zend_string_equals_literal(name, "str_ends_with")
+		|| zend_string_equals_literal(name, "stripos")
+		|| zend_string_equals_literal(name, "str_ireplace")
+		|| zend_string_equals_literal(name, "stristr")
 		|| zend_string_equals_literal(name, "str_replace")
 		|| zend_string_equals_literal(name, "str_split")
 		|| zend_string_equals_literal(name, "str_starts_with")
+		|| zend_string_equals_literal(name, "strtolower")
+		|| zend_string_equals_literal(name, "strtoupper")
 		|| zend_string_equals_literal(name, "strpos")
 		|| zend_string_equals_literal(name, "strstr")
 		|| zend_string_equals_literal(name, "substr")
 		|| zend_string_equals_literal(name, "trim")
+		|| zend_string_equals_literal(name, "ucfirst")
+		|| zend_string_equals_literal(name, "ucfirst")
+		|| zend_string_equals_literal(name, "ucwords")
 		|| zend_string_equals_literal(name, "urldecode")
 		|| zend_string_equals_literal(name, "urlencode")
 		|| zend_string_equals_literal(name, "version_compare")