Fix leak. Should bring back the valgrind bot.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185663 91177308-0d34-0410-b5e6-96231b3b80d8
Add support for archives with no symbol table or string table.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@185664 91177308-0d34-0410-b5e6-96231b3b80d8