Use sse4.2 CRC32 instructions to hash when available.

BUILD.gn

 # Copyright 2016 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 declare_args() {
 }
 
 skia_public_includes = [
   "include/android",
@@ skipping 136 matching lines @@
   cflags = [ "-mssse3" ]
 }
 
 source_set("opts_sse41") {
   configs += skia_library_configs
 
   sources = opts_gypi.sse41_sources
   cflags = [ "-msse4.1" ]
 }
 
+source_set("opts_sse42") {
+  configs += skia_library_configs
+
+  sources = opts_gypi.sse42_sources
+  cflags = [ "-msse4.2" ]
+}
+
 source_set("opts_avx") {
   configs += skia_library_configs
 
   sources = opts_gypi.avx_sources
   cflags = [ "-mavx" ]
 }
 
 component("skia") {
   public_configs = [ ":skia_public" ]
   configs += skia_library_configs
 
   deps = [
     ":opts_avx",
     ":opts_sse41",
+    ":opts_sse42",
     ":opts_ssse3",
     "//third_party/expat",
     "//third_party/giflib",
     "//third_party/libjpeg_turbo",
     "//third_party/libpng",
     "//third_party/libwebp",
     "//third_party/sfntly",
     "//third_party/zlib",
   ]
 
@@ skipping 373 matching lines @@
       "tools/SkShaper_harfbuzz.cpp",
       "tools/using_skia_and_harfbuzz.cpp",
     ]
     deps = [
       ":skia",
       "//third_party/harfbuzz",
     ]
     testonly = true
   }
 }