tweak PATCH to std_gimplify_va_arg_expr

[Jason Merrill]

The code to increment the va_ptr can go on the postqueue, allowing the
value of the va_arg to be used immediately; I assume that when rth changed
it to go on the prequeue instead, that was an oversight.  Right?

Booted and tested x86_64-pc-linux-gnu.  Not applied at this time, as I'm
not sure it's suitable for the current branch state.

2004-12-23  Jason Merrill  <jason@redhat.com>

	* builtins.c (std_gimplify_va_arg_expr): Put increment on
	postqueue, not pre.

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