Fix NameAnonFunctions pass: for ThinLTO we need to rename global variables as well

A follow-up patch will rename this pass and the source file accordingly,
but I figured the non-NFC change will be easier to spot in isolation.

Differential Revision: https://reviews.llvm.org/D24641

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@281744 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed