PATCH to add tree.c:expr_last

[Jason Merrill]

expr_last is a new utility function that does for COMPOUND_EXPRs what
tree_last does for TREE_LISTs.

Objective-C had a static function with the same name; its purpose was
different and not immediately apparent, so I just renamed it to
objc_expr_last.

Booted and tested i686-pc-linux-gnu, applied to trunk and tree-ssa.

2003-05-20  Jason Merrill  <jason@redhat.com>

	* tree.c (expr_last): New fn.
	* tree.h: Declare it.
	* objc/objc-act (expr_last): Rename to objc_expr_last.

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