Make the representation of AliasSets explicitly differentiate
between "not known yet" and "known no tbaa info" so that it
can merge them properly.

llvm-svn: 116767
2 files changed
tree: 75f696f49b9e7646af6bc1452fac0296b9f8ba46
  1. clang/
  2. compiler-rt/
  3. debuginfo-tests/
  4. libcxx/
  5. lldb/
  6. llvm/