Use union for the payload of struct Lisp_Vector.

This helps to avoid a few glitches dictated by C's aliasing rules.
* lisp.h (struct Lisp_Vector): Use union for next and
contents member.  Adjust comment.  Change related users.
* alloc.c (next_in_free_list, set_next_in_free_list): Remove.
Related users changed.
* buffer.c, bytecode.c, ccl.c, character.h, chartab.c, composite.c:
* composite.h, disptab.h, fns.c, fontset.c, indent.c, keyboard.c:
* lread.c, msdos.c, process.c, w32menu.c, window.c, xdisp.c:
* xfaces.c, xfont.c, xmenu.c: Related users changed.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/bytecode.c b/src/bytecode.c
index 3ac8b452fbe..23e50826633 100644
--- a/src/bytecode.c
+++ b/src/bytecode.c
@@ -536,7 +536,7 @@ exec_byte_code (Lisp_Object bytestr, Lisp_Object vector, Lisp_Object maxdepth,
 #ifdef BYTE_CODE_SAFE
   bytestr_length = SBYTES (bytestr);
 #endif
-  vectorp = XVECTOR (vector)->contents;
+  vectorp = XVECTOR (vector)->u.contents;
 
   stack.byte_string = bytestr;
   stack.pc = stack.byte_string_start = SDATA (bytestr);