Add a static_assert about the sizeof(GlobalValue)

I added one for Value back in r262045, and I'm starting to think we
should have these for any class with bitfields whose memory efficiency
really matters.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290698 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed