Sync x86 perlasm drivers with upstream master.

Upstream added new instructions in
f4d456408d9d7bca31f34765d1a05fbd9fa55826 and
4e3d2866b6e8e7a700ea22e05840a093bfd7a4b1.

Change-Id: I835650426a0dffca2d8686d64aef99097a4bd186
Reviewed-on: https://boringssl-review.googlesource.com/8520
Reviewed-by: Adam Langley <agl@google.com>

crypto/perlasm/x86asm.pl

diff --git a/crypto/perlasm/x86asm.pl b/crypto/perlasm/x86asm.pl
index 3c7be40..dc10d99 100644
--- a/crypto/perlasm/x86asm.pl
+++ b/crypto/perlasm/x86asm.pl
@@ -1,4 +1,11 @@
-#!/usr/bin/env perl
+#! /usr/bin/env perl
+# Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
 
 # require 'x86asm.pl';
 # &asm_init(<flavor>,"des-586.pl"[,$i386only]);
@@ -131,6 +138,14 @@
     {	&::generic("rdrand",@_);	}
 }
 
+sub ::rdseed
+{ my ($dst)=@_;
+    if ($dst =~ /(e[a-dsd][ixp])/)
+    {	&::data_byte(0x0f,0xc7,0xf8|$regrm{$dst});	}
+    else
+    {	&::generic("rdrand",@_);	}
+}
+
 sub rxb {
  local *opcode=shift;
  my ($dst,$src1,$src2,$rxb)=@_;
@@ -157,6 +172,11 @@
     {	&::generic("vprotd",@_);	}
 }
 
+sub ::endbranch
+{
+    &::data_byte(0xf3,0x0f,0x1e,0xfb);
+}
+
 # label management
 $lbdecor="L";		# local label decoration, set by package
 $label="000";

crypto/perlasm/x86gas.pl

diff --git a/crypto/perlasm/x86gas.pl b/crypto/perlasm/x86gas.pl
index 55d09d8..ab4c5a3 100644
--- a/crypto/perlasm/x86gas.pl
+++ b/crypto/perlasm/x86gas.pl
@@ -1,4 +1,11 @@
-#!/usr/bin/env perl
+#! /usr/bin/env perl
+# Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
 
 package x86gas;
 

crypto/perlasm/x86masm.pl

diff --git a/crypto/perlasm/x86masm.pl b/crypto/perlasm/x86masm.pl
index 917d0f8..a0a354c 100644
--- a/crypto/perlasm/x86masm.pl
+++ b/crypto/perlasm/x86masm.pl
@@ -1,4 +1,11 @@
-#!/usr/bin/env perl
+#! /usr/bin/env perl
+# Copyright 2007-2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
 
 package x86masm;
 

crypto/perlasm/x86nasm.pl

diff --git a/crypto/perlasm/x86nasm.pl b/crypto/perlasm/x86nasm.pl
index f8332bb..d159514 100644
--- a/crypto/perlasm/x86nasm.pl
+++ b/crypto/perlasm/x86nasm.pl
@@ -1,4 +1,11 @@
-#!/usr/bin/env perl
+#! /usr/bin/env perl
+# Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
+#
+# Licensed under the OpenSSL license (the "License").  You may not use
+# this file except in compliance with the License.  You can obtain a copy
+# in the file LICENSE in the source distribution or at
+# https://www.openssl.org/source/license.html
+
 
 package x86nasm;