Add BMI2 intrinsics.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147275 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Headers/immintrin.h b/lib/Headers/immintrin.h
index 7499923..1605525 100644
--- a/lib/Headers/immintrin.h
+++ b/lib/Headers/immintrin.h
@@ -64,6 +64,10 @@
 #include <bmiintrin.h>
 #endif
 
+#ifdef __BMI2__
+#include <bmi2intrin.h>
+#endif
+
 #ifdef __LZCNT__
 #include <lzcntintrin.h>
 #endif