Define S_IRXO, S_ISREG in SysStat.h

Reviewed By: yfeldblum

Differential Revision: D26848785

fbshipit-source-id: 441aeac55f51ee8ec5e2316288f2c1f778a60dda

folly/portability/SysStat.h

@@ -34,8 +34,10 @@
 #define S_IROTH S_IRUSR
 #define S_IRWXU (S_IRUSR | S_IWUSR | S_IXUSR)
 #define S_IRWXG (S_IRGRP | S_IWGRP | S_IXGRP)
+#define S_IRWXO (S_IROTH | S_IWOTH | S_IXOTH)
 
 #define S_ISDIR(mode) (((mode) & (_S_IFDIR)) == (_S_IFDIR) ? 1 : 0)
+#define S_ISREG(mode) (((mode) & (_S_IFREG)) == (_S_IFREG) ? 1 : 0)
 
 // This isn't defined anywhere, so give a sane value.
 #define MAXSYMLINKS 255