SSE2 is not enabled by default on BSDs

core/utilities/clflush.cpp:16:5: error: '_mm_clflush' needs target feature sse2
    _mm_clflush(ptr);
    ^

--- core/utilities/clflush.cpp.orig	2019-11-29 14:23:34 UTC
+++ core/utilities/clflush.cpp
@@ -12,6 +12,9 @@
 namespace NEO {
 namespace CpuIntrinsics {
 
+#ifdef __GNUC__
+__attribute__((target("sse2")))
+#endif
 void clFlush(void const *ptr) {
     _mm_clflush(ptr);
 }