* c-common.c, c-decl.c, c-lang.c, c-lex.c, c-parse.in, c-pragma.c,

	c-typeck.c, objc/objc-act.c: Remove all references to obstack
	functions obsoleted by GC, such as push_obstacks_nochange,
	end_temporary_allocation, savealloc, saveable_tree_cons, etc.
	and code which existed only to decide whether or not to call
	them.  Remove now-unused NESTED argument from start_function;
	all callers changed.  Do not change behavior based on ggc_p.
	The use of the ixp_obstack in c-iterate.c and the util_obstack
	in objc/objc-act.c remain; these are not obsoleted by garbage
	collection.
	* c-tree.h: Update prototype for start_function.

	* c-parse.y, c-parse.c, objc/objc-parse.c, objc/objc-parse.y: Rebuild.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@31611 138bc75d-0d04-0410-961f-82ee72b054a4

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