Include intrin.h in CpuId for the cpuid builtins

Summary: Some shuffling and elmination of other includes exposed the fact that this was calling the cpuid builtins, but hadn't included the header they were defined in.

Reviewed By: yfeldblum

Differential Revision: D3704321

fbshipit-source-id: 332c2d22714abaa74090abe7e7a5b28aec6b905a

folly/CpuId.h

@@ -19,6 +19,10 @@
 #include <cstdint>
 #include <folly/Portability.h>
 
+#ifdef _MSC_VER
+#include <intrin.h>
+#endif
+
 namespace folly {
 
 /**