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In a Mach-O object file a relocatable expression of the form SymbolA - SymbolB + constant is allowed when both symbols are defined in a section. But when either symbol is undefined it is an error. The code was crashing when it had an undefined symbol in this case. And should have printed a error message using the location information in the relocation entry. rdar://18678402 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220599 91177308-0d34-0410-b5e6-96231b3b80d8
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