Revert r295861, "[ModuleSummaryAnalysis] Don't crash when referencing unnamed globals."

We should always expect values to be named before running the module summary
analysis (see NameAnonGlobals pass), so it's fine if we crash in that case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301991 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed