tsan: remove expected race leftover

Remove nmissed_expected variable.
It's a leftover from removed "expected race" feature and is never incremented.

Reviewed By: melver

Differential Revision: https://reviews.llvm.org/D110321

compiler-rt/lib/tsan/rtl/tsan_rtl.cpp

@@ -108,7 +108,6 @@ Context::Context()
     : initialized(),
       report_mtx(MutexTypeReport),
       nreported(),
-      nmissed_expected(),
       thread_registry(CreateThreadContext, kMaxTid, kThreadQuarantineSize,
                       kMaxTidReuse),
       racy_mtx(MutexTypeRacy),
@@ -464,12 +463,6 @@ int Finalize(ThreadState *thr) {
 #endif
   }
 
-  if (ctx->nmissed_expected) {
-    failed = true;
-    Printf("ThreadSanitizer: missed %d expected races\n",
-        ctx->nmissed_expected);
-  }
-
   if (common_flags()->print_suppressions)
     PrintMatchedSuppressions();
 

compiler-rt/lib/tsan/rtl/tsan_rtl.h

@@ -306,7 +306,6 @@ struct Context {
 
   Mutex report_mtx;
   int nreported;
-  int nmissed_expected;
   atomic_uint64_t last_symbolize_time_ns;
 
   void *background_thread;