Verifier: Function metadata attachments require a body

Add a verifier check that only functions with bodies have metadata
attachments.  This should help catch bugs in frontends and
transformation passes.  Part of PR23340.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235784 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed