tsan: introduce __tsan_default_options() function
tsan: introduce __tsan_default_options() function

The function allows to statically setup default values for flags.
The interafece matches what asan/msan provide.



git-svn-id: c199f293c43da69278bea8e88f92242bf3aa95f7@192715 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt,llvm-mirror/compiler-rt