[PATCH] Add generic ThreadRegistry class for sanitizer runtimes.

[Kostya Serebryany]

================
Comment at: lib/sanitizer_common/sanitizer_thread_registry.h:44
@@ +43,3 @@
+
+  const int tid;  // Thread ID. Main thread should have tid = 0.
+  int unique_id;  // Unique thread ID.
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shouldn't this be u32? 


http://llvm-reviews.chandlerc.com/D530