Update testsuite strucuture to latest draft

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@120041 91177308-0d34-0410-b5e6-96231b3b80d8
tree: 844a1e19ac7b1271e699cf3309acd8f315e4b881
  1. include/
  2. lib/
  3. src/
  4. test/
  5. www/
  6. CREDITS.TXT
  7. LICENSE.TXT
  8. Makefile