adding const attribute to trailing/leading zeros helpers. (#13861)

and adding noreturn to php_sighup_handler for compiler/dev clarification sake.

Author: devnexen

Zend/zend_bitset.h

@@ -45,7 +45,7 @@ typedef zend_ulong *zend_bitset;
 	(zend_bitset)do_alloca((n) * ZEND_BITSET_ELM_SIZE, use_heap)
 
 /* Number of trailing zero bits (0x01 -> 0; 0x40 -> 6; 0x00 -> LEN) */
-static zend_always_inline int zend_ulong_ntz(zend_ulong num)
+ZEND_ATTRIBUTE_CONST static zend_always_inline int zend_ulong_ntz(zend_ulong num)
 {
 #if (defined(__GNUC__) || __has_builtin(__builtin_ctzl)) \
 	&& SIZEOF_ZEND_LONG == SIZEOF_LONG && defined(PHP_HAVE_BUILTIN_CTZL)
@@ -83,7 +83,7 @@ static zend_always_inline int zend_ulong_ntz(zend_ulong num)
 }
 
 /* Number of leading zero bits (Undefined for zero) */
-static zend_always_inline int zend_ulong_nlz(zend_ulong num)
+ZEND_ATTRIBUTE_CONST static zend_always_inline int zend_ulong_nlz(zend_ulong num)
 {
 #if (defined(__GNUC__) || __has_builtin(__builtin_clzl)) \
 	&& SIZEOF_ZEND_LONG == SIZEOF_LONG && defined(PHP_HAVE_BUILTIN_CLZL)

sapi/phpdbg/phpdbg.c

@@ -1066,7 +1066,7 @@ void phpdbg_signal_handler(int sig, siginfo_t *info, void *context) /* {{{ */
 } /* }}} */
 
 
-void phpdbg_sighup_handler(int sig) /* {{{ */
+ZEND_NORETURN void phpdbg_sighup_handler(int sig) /* {{{ */
 {
 	exit(0);
 } /* }}} */