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llvm::getDISubprogram walks the instructions in a function, looking for one in the scope of the current function, so that it can find the !dbg entry for the subprogram itself. Now that !dbg is attached to functions, this should not be necessary. This patch changes all uses to just query the subprogram directly on the function. Ideally this should be NFC, but in reality its possible that a function: has no !dbg (in which case there's likely a bug somewhere in an opt pass), or that none of the instructions had a scope referencing the function, so we used to not find the !dbg on the function but now we will Reviewed by Duncan Exon Smith. Differential Revision: http://reviews.llvm.org/D18074 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@263184 91177308-0d34-0410-b5e6-96231b3b80d8
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