[IR] Allow increasing the alignment of dso-local globals.

I think this is the actual important property; the previous visibility
check was an approximation.

Differential Revision: https://reviews.llvm.org/D53852



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@345790 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed