Use sse4.2 CRC32 instructions to hash when available.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 76b04d59b611fdfb5eb9f636f663e9d157baaf5c..ff3c492ffde7e72d7f8d4df9fa836e172e42ec04 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -158,6 +158,13 @@ source_set("opts_sse41") {
   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
 
@@ -172,6 +179,7 @@ component("skia") {
   deps = [
     ":opts_avx",
     ":opts_sse41",
+    ":opts_sse42",
     ":opts_ssse3",
     "//third_party/expat",
     "//third_party/giflib",