Use less TSan ignores for base/atomic*...

tools/valgrind/tsan/ignores_mac.txt

 # This file lists the functions, object files and source files
 # which should be ignored (i.e. not instrumented) by ThreadSanitizer on Mac OS.
 # At the moment the Chromium binaries' debug info is not available to
 # ThreadSanitizer, so we have to define fun:* rules for Mac OS complementing
 # the src:* rules defined for Linux.
 
-# Don't instrument code dealing with atomics (base::subtle)
-fun:*base*subtle*NoBarrier_Load*
-fun:*base*subtle*Release_Store*
-fun:*base*subtle*NoBarrier_Store*
-fun:*base*subtle*NoBarrier_CompareAndSwap*
-
 # we ignore the Security libraries for now since
 # their instrumentation is very slow.
 # TODO(timurrrr): investigate whether we need to instrument them
 obj:*/Security*
 obj:*/libcrypto*
 # SensitiveAllocator::free is a part of the Security framework.
 # It calls bzero (0xffff0633) which can't be resolved and thus should be
 # ignored recursively.
 fun_r:*SensitiveAllocator*free*
 
 # The CFBag and CFDictionary operators should be thread-safe, but they are not
 # annotated properly.
 # TODO(glider): replace all the CoreFoundation suppressions with ignores.
 fun_r:CFBag*
 fun_r:CFDictionary*
 
 # see crbug.com/46138
 fun_r:__CFRunLoopDeallocate