[LibCalls] Added returned attribute to libcalls

Reviewers: efriedma

Reviewed By: efriedma

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D51092

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@340512 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed