tsan: fix lint warning


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178157 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: better flag parsing: do not confuse flag that is a part of another flag
(e.g. suppressions and print_suppressions)



git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178158 91177308-0d34-0410-b5e6-96231b3b80d8