PATCH for middle-end/15885

[Jason Merrill]

This patch fixes 15885 by special-casing BUILT_IN_VA_START in
gimplify_call_expr.  Other possible approaches would be to create a
VA_START_EXPR, or to lower va_start.  rth has talked about doing the latter
at some point, but this should hold us for now.

Tested x86_64-pc-linux-gnu, applied to trunk.

2004-07-14  Jason Merrill  <jason@redhat.com>

	PR middle-end/15885
	* gimplify.c (gimplify_arg): New fn, split out from...
	(gimplify_call_expr): Here.  Special-case BUILT_IN_VA_START.

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