Code-gen may inject code into the IR before it emits the ASM. The linker

Code-gen may inject code into the IR before it emits the ASM. The linker
obviously cannot know that this code is present, let alone used. So prevent the
internalize pass from internalizing those global values which code-gen may
insert.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154645 91177308-0d34-0410-b5e6-96231b3b80d8