Remove an accidental change from r147370. Would only break if the new fma4 flag was used.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@147371 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Headers/x86intrin.h b/lib/Headers/x86intrin.h
index 5f9bea7..138f850 100644
--- a/lib/Headers/x86intrin.h
+++ b/lib/Headers/x86intrin.h
@@ -42,10 +42,6 @@
 #include <popcntintrin.h>
 #endif
 
-#ifdef __FMA4__
-#include <fma4intrin.h>
-#endif
-
 // FIXME: SSE4A, 3dNOW, XOP, LWP, ABM
 
 #endif /* __X86INTRIN_H */