[PATCH] Support building tsan_test_util_linux.cc on FreeBSD

[Ed Maste]

================
Comment at: lib/tsan/tests/rtl/tsan_test_util_linux.cc:13
@@ -12,3 +12,3 @@
 //
 // Test utils, linux implementation.
 //===----------------------------------------------------------------------===//
----------------
Comment here should be adjusted.

IIRC we have no immediate plans to rename the files to indicate they apply to more than just Linux.so a comment could alleviate confusion for someone looking at this code in the future.

http://reviews.llvm.org/D5210