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c818be073d
GlobalAliases may reference function definitions, but not function declarations. bugpoint would sometimes create invalid IR by deleting a function's body (thus mutating a function definition into a declaration) without first 'fixing' any GlobalAliases that reference that function definition. This change iteratively prevents that issue. Before deleting a function's body, it scans the module for GlobalAliases which reference that function. When found, it eliminates them using replaceAllUsesWith. Fixes PR20788. Patch by Nick Johnson! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254171 91177308-0d34-0410-b5e6-96231b3b80d8