[PATCH] Sanitizers: Implement `GetRSS` on Mac OS X

[Alexander Potapenko]

LGTM with two nits.


================
Comment at: lib/sanitizer_common/sanitizer_mac.cc:47
@@ -46,2 +46,3 @@
 #include <errno.h>
+#include <mach/mach.h>
 
----------------
While at it, can you please sort this block of includes alphabetically?

================
Comment at: lib/sanitizer_common/sanitizer_mac.cc:343
@@ +342,3 @@
+    Report("Cannot get task info. Error: %d\n", result);
+    Die();
+  }
----------------
NB: currently task_info() can't possibly return anything but KERN_SUCCESS, so it's perfectly fine to die.

================
Comment at: lib/sanitizer_common/sanitizer_mac.cc:345
@@ +344,3 @@
+  }
+
+  return info.resident_size;
----------------
Nit: spare newline.

http://reviews.llvm.org/D9636

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