We always(and only) check the NLP flag after calling
classifyGlobalReference to see whether it is accessed
indirectly.
Refactor to code to use isGVIndirectSym instead.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@372417 91177308-0d34-0410-b5e6-96231b3b80d8