Add AVX/AVX2 support for runtime check

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1867193002
CQ_EXTRA_TRYBOTS=client.skia:Test-Ubuntu-GCC-GCE-CPU-AVX2-x86_64-Release-SKNX_NO_SIMD-Trybot

Review URL: https://codereview.chromium.org/1867193002
diff --git a/AUTHORS b/AUTHORS
index 893569c..a6ade42 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -30,6 +30,7 @@
 Pavel Krajcevski <pavel@cs.unc.edu>
 Samsung <*@samsung.com>
 Samsung Open Source Group <*@osg.samsung.com>
+Sergey Melnikov <Melnikov.Sergey.V@gmail.com>
 Skia <*@skia.org>
 Skia Buildbots <skia.buildbots@gmail.com>
 Sony Mobile Communications Inc. <*@sonymobile.com>
diff --git a/src/opts/opts_check_x86.cpp b/src/opts/opts_check_x86.cpp
index 0ee78c5..e0e84f3 100644
--- a/src/opts/opts_check_x86.cpp
+++ b/src/opts/opts_check_x86.cpp
@@ -15,6 +15,19 @@
 #include "SkOncePtr.h"
 #include "SkRTConf.h"
 
+
+/*
+ *****************************************
+ *********This file is deprecated*********
+ *****************************************
+ * New CPU-specific work should be done in
+ * SkOpts framework. Run-time detection of
+ * available instruction set extensions is
+ * implemented in src/core/SkOpts.cpp file
+ *****************************************
+ */
+
+
 #if defined(_MSC_VER) && defined(_WIN64)
 #include <intrin.h>
 #endif