C++ PATCH to warn about inlines which fail to return a value

[Jason Merrill]

Applying some of the additional bits from the C version to C++.  Tested
i686-pc-linux-gnu.

2002-02-13  Jason Merrill  <jason@redhat.com>

	* decl.c (builtin_function): Set TREE_THIS_VOLATILE on return fns.
	(finish_function): Don't warn if current_function_returns_null.

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