forcing tail/sibling call optimization

[Richard Henderson]

On Tue, Sep 17, 2002 at 12:17:55PM +1000, Fergus Henderson wrote:
> 	* tree.h (CALL_EXPR_TAILCALL): New boolean field.
> 	* calls.c (expand_call): Use it, and copy to the CALL_PLACEHOLDER RTX.
> 	* rtl.def (CALL_PLACEHOLDER): Add new boolean field.
> 	* integrate.c (copy_insn_list): Copy it.
> 	* sibcall.c (optimize_sibling_and_tail_recursive_call): Use it.

Ok for basic-improvements-branch.


r~