bug#25128: Reorder lisp.h to declare types before using them

[Paul Eggert]

Tags: patch

Attached is a patch to reorder src/lisp.h so that more types are declared before 
use. The main motivation is to eventually add support for 
-fcheck-pointer-bounds; future changes will need access to type sizes (e.g., 
XCONS might need sizeof (struct Lisp_Cons)), which should be easy after this 
change. Also, the change shortens lisp.h a bit and (if you ask me) makes it 
easier to read, since the basic functions for a type are now declared next to 
the type.

I would like to install this soon, and am posting this as a bug report to give 
Eli and others a heads-up, in case some MS-Windows module now needs to include 
process.h. This may be needed because XPROCESS is now defined in process.h 
instead of lisp.h; similarly for buffer.h, window.h, termhooks.h.

0001-Reorder-lisp.h-to-declare-types-before-using-them.patch
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