Fix the condition for when the new global takes over the name of
the existing one to be the negation of the condition for the new
global to get internal linkage.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@258355 91177308-0d34-0410-b5e6-96231b3b80d8
Evgeniy Stepanov