Use sse4.2 CRC32 instructions to hash when available.

cmake/CMakeLists.txt

Index: cmake/CMakeLists.txt
diff --git a/cmake/CMakeLists.txt b/cmake/CMakeLists.txt
index b18510ebd4b66e0c1e7fddf43bb5742f4020eb4f..fd1b98cc56e6111a67ab18d4d7e3f5b0c3f4a3e9 100644
--- a/cmake/CMakeLists.txt
+++ b/cmake/CMakeLists.txt
@@ -130,12 +130,14 @@ endif()
 
 # Certain files must be compiled with support for SSSE3, SSE4.1, AVX, or AVX2 intrinsics.
 file (GLOB_RECURSE ssse3_srcs ../src/*ssse3*.cpp ../src/*SSSE3*.cpp)
-file (GLOB_RECURSE sse41_srcs ../src/*sse4*.cpp ../src/*SSE4*.cpp)
+file (GLOB_RECURSE sse41_srcs ../src/*sse41*.cpp ../src/*SSE41*.cpp)
+file (GLOB_RECURSE sse42_srcs ../src/*sse42*.cpp ../src/*SSE42*.cpp)
 file (GLOB_RECURSE avx_srcs   ../src/*_avx.cpp)
 file (GLOB_RECURSE avx2_srcs  ../src/*_avx2.cpp)
 if (NOT WIN32)
     set_source_files_properties(${ssse3_srcs} PROPERTIES COMPILE_FLAGS -mssse3)
     set_source_files_properties(${sse41_srcs} PROPERTIES COMPILE_FLAGS -msse4.1)
+    set_source_files_properties(${sse42_srcs} PROPERTIES COMPILE_FLAGS -msse4.2)
     set_source_files_properties(${avx_srcs}   PROPERTIES COMPILE_FLAGS -mavx)
     set_source_files_properties(${avx2_srcs}  PROPERTIES COMPILE_FLAGS -mavx2)
 endif()