Use sse4.2 CRC32 instructions to hash when available.

BUILD.gn

Index: BUILD.gn
diff --git a/BUILD.gn b/BUILD.gn
index 0d15f3169c54d6730fe2750a30d2ca6411a37690..6b9741f5c2c0c9ad6bfcafb8f350ee276e8fe0fc 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -154,6 +154,13 @@ 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
 
@@ -168,6 +175,7 @@ component("skia") {
   deps = [
     ":opts_avx",
     ":opts_sse41",
+    ":opts_sse42",
     ":opts_ssse3",
     "//third_party/expat",
     "//third_party/giflib",