[LSan] remove unneeded empty directory

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183392 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] move all lit_tests under TestCases

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@183395 91177308-0d34-0410-b5e6-96231b3b80d8