Propagate nonnull and dereferenceable throught launder

Summary:
invariant.group.launder should not stop propagation
of nonnull and dereferenceable, because e.g. we would not be
able to hoist loads speculatively.

Reviewers: rsmith, amharc, kuhar, xbolva00, hfinkel

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D46972

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332788 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed