[PATCH] [ASan] Make BlockingMutex really linker initialized.

[Yury Gribov]

REPOSITORY
  rL LLVM

================
Comment at: lib/sanitizer_common/sanitizer_linux.cc:501
@@ -504,2 +500,3 @@
 void BlockingMutex::Lock() {
+  CHECK_EQ(owner_, 0);
   atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
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samsonov wrote:
> owner_ isn't used in any other BlockingMutex functions on Linux. Let's just delete this line.
Then the field would become unused causing build errors. And removing it just for Linux would cause more #ifdefs. BTW what's the reason for different treatment of owner_ on Linux and Mac? Looks like Mac check got strengthened at some point.

http://reviews.llvm.org/D7171

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