Sync aes/asm with stable branch.

crypto/aes/asm/aes-586.pl

@@ -955,8 +955,9 @@ my $mark=&DWP(60+240,"esp");	#copy of aes_key->rounds
 
     &align	(4);
     &set_label("enc_tail");
-	&push	($key eq "edi" ? $key : "");	# push ivp
+	&mov	($s0,$key eq "edi" ? $key : "");
 	&mov	($key,$_out);			# load out
+	&push	($s0);				# push ivp
 	&mov	($s1,16);
 	&sub	($s1,$s2);
 	&cmp	($key,$acc);			# compare with inp

crypto/aes/asm/aes-x86_64.pl

@@ -1198,6 +1198,8 @@ AES_cbc_encrypt:
 	ret
 .align	4
 .Lcbc_enc_tail:
+	mov	%rax,%r11
+	mov	%rcx,%r12
 	mov	%r10,%rcx
 	mov	$inp,%rsi
 	mov	$out,%rdi
@@ -1208,6 +1210,8 @@ AES_cbc_encrypt:
 	.long	0xF689AAF3		# rep stosb
 	mov	$out,$inp		# this is not a mistake!
 	movq	\$16,$_len		# len=16
+	mov	%r11,%rax
+	mov	%r12,%rcx
 	jmp	.Lcbc_enc_loop		# one more spin...
 #----------------------------- DECRYPT -----------------------------#
 .align	16