Add missing .register declarations.
Initalize __va_alist->anum to 0.

--- vacall/vacall-sparc64.S.orig	Wed Jun  2 12:00:42 2004
+++ vacall/vacall-sparc64.S	Thu Apr  9 19:15:56 2009
@@ -4,6 +4,8 @@
 .section	".text"
 	.align 4
 	.global __vacall
+	.register %g2, #scratch
+	.register %g3, #scratch
 	DECLARE_FUNCTION(__vacall)
 	.type	 __vacall,$function
 	.proc	020
@@ -57,6 +59,7 @@ __vacall:
 	st	%f31, [%fp+1895]
 	st	%g0, [%fp+1775]
 	stx	%g0, [%fp+1791]
+	st	%g0, [%fp+1831]
 	call	%o2, 0
 	st	%g0, [%fp+1799]
 	ld	[%fp+1799], %o0
