Pacify GCC 10.1.0

Pacify GCC 10.1.0 so that it does not issue false alarms
when Emacs is configured with --enable-gcc-warnings.
* src/dispnew.c (clear_glyph_row):
* src/fns.c (hash_clear):
* src/keyboard.c (append_tab_bar_item):
* src/lisp.h (vcopy):
* src/xfaces.c (get_lface_attributes_no_remap)
(Finternal_copy_lisp_face, realize_default_face):
* src/xmenu.c (set_frame_menubar):
Work around -Warray-bounds false alarm in GCC 10.1.0.
* src/intervals.c (copy_properties):
Avoid -Wnull-dereference false alarm in GCC 10.1.0.
* src/lisp.h (xvector_contents_addr, xvector_contents):
New functions, useful for working around GCC bug 95072.

1 files changed, 2 insertions, 1 deletions

diff --git a/src/intervals.c b/src/intervals.c
index d4a734c923c..0257591a142 100644
--- a/src/intervals.c
+++ b/src/intervals.c
@@ -117,10 +117,11 @@ create_root_interval (Lisp_Object parent)
 /* Make the interval TARGET have exactly the properties of SOURCE.  */
 
 void
-copy_properties (register INTERVAL source, register INTERVAL target)
+copy_properties (INTERVAL source, INTERVAL target)
 {
   if (DEFAULT_INTERVAL_P (source) && DEFAULT_INTERVAL_P (target))
     return;
+  eassume (source && target);
 
   COPY_INTERVAL_CACHE (source, target);
   set_interval_plist (target, Fcopy_sequence (source->plist));