0From: Alexandre Oliva <oliva@adacore.com>

0From: Alexandre Oliva <oliva@adacore.com>

strub: introduce STACK_ADDRESS_OFFSET

Since STACK_POINTER_OFFSET is not necessarily at the boundary between
caller- and callee-owned stack, as desired by
__builtin_stack_address(), and using it as if it were or not causes
problems, introduce a new macro so that ports can define it suitably,
without modifying STACK_POINTER_OFFSET.

for  gcc/ChangeLog

	PR middle-end/112917
	PR middle-end/113100
	* builtins.cc (expand_builtin_stack_address): Use
	STACK_ADDRESS_OFFSET.
	* doc/extend.texi (__builtin_stack_address): Adjust.
	* config/sparc/sparc.h (STACK_ADDRESS_OFFSET): Define.
	* doc/tm.texi.in (STACK_ADDRESS_OFFSET): Document.
	* doc/tm.texi: Rebuilt.