crypto/poly1305/asm: fix armv8 pointer authentication

PAC pointer authentication signs the return address against the value
of the stack pointer, to prevent stack overrun exploits from corrupting
the control flow. However, this requires that the AUTIASP is issued with
SP holding the same value as it held when the PAC value was generated.
The Poly1305 armv8 code got this wrong, resulting in crashes on PAC
capable hardware.

Reviewed-by: Paul Dale <paul.dale@oracle.com>
Reviewed-by: Tomas Mraz <tmraz@fedoraproject.org>
(Merged from #13256)

(cherry picked from commit fcf6e9d)

crypto/poly1305/asm/poly1305-armv8.pl

@@ -864,8 +864,8 @@
 	st1	{$ACC4}[0],[$ctx]
 
 .Lno_data_neon:
-	.inst	0xd50323bf		// autiasp
 	ldr	x29,[sp],#80
+	.inst	0xd50323bf		// autiasp
 	ret
 .size	poly1305_blocks_neon,.-poly1305_blocks_neon