Use ARMv8 CRC32 instructions for SkOpts::hash().

gyp/opts.gypi

 # Copyright 2015 Google Inc.
 #
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 {
         'none_sources': [
             '<(skia_src_path)/opts/SkBitmapProcState_opts_none.cpp',
             '<(skia_src_path)/opts/SkBlitMask_opts_none.cpp',
             '<(skia_src_path)/opts/SkBlitRow_opts_none.cpp',
         ],
@@ skipping 12 matching lines @@
         'arm64_sources': [
             '<(skia_src_path)/opts/SkBitmapProcState_arm_neon.cpp',
             '<(skia_src_path)/opts/SkBitmapProcState_matrixProcs_neon.cpp',
             '<(skia_src_path)/opts/SkBitmapProcState_opts_arm.cpp',
             '<(skia_src_path)/opts/SkBlitMask_opts_arm.cpp',
             '<(skia_src_path)/opts/SkBlitMask_opts_arm_neon.cpp',
             '<(skia_src_path)/opts/SkBlitRow_opts_arm.cpp',
             '<(skia_src_path)/opts/SkBlitRow_opts_arm_neon.cpp',
         ],
         'crc32_sources': [
-            '<(skia_src_path)/core/SkForceCPlusPlusLinking.cpp',
+            '<(skia_src_path)/opts/SkOpts_crc32.cpp',
         ],
 
         'mips_dsp_sources': [
             '<(skia_src_path)/opts/SkBitmapProcState_opts_mips_dsp.cpp',
             '<(skia_src_path)/opts/SkBlitMask_opts_none.cpp',
             '<(skia_src_path)/opts/SkBlitRow_opts_mips_dsp.cpp',
         ],
 
         'sse2_sources': [
             '<(skia_src_path)/opts/SkBitmapFilter_opts_SSE2.cpp',
@@ skipping 12 matching lines @@
             '<(skia_src_path)/opts/SkOpts_sse42.cpp',
         ],
         'avx_sources': [
             '<(skia_src_path)/opts/SkOpts_avx.cpp',
         ],
         # These targets are empty, but XCode doesn't like that, so add an empty file to each.
         'avx2_sources': [
             '<(skia_src_path)/core/SkForceCPlusPlusLinking.cpp',
         ],
 }