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The "dereferenceable" attribute cannot be added via .addAttribute(), since it also expects a size in bytes. AttrBuilder#addAttribute or AttributeSet#addAttribute is wrapped by classes Function, InvokeInst, and CallInst. Add corresponding wrappers to AttrBuilder#addDereferenceableAttr. Having done this, propagate the dereferenceable attribute via gc.relocate, adding a test to exercise it. Note that -datalayout is required during execution over and above -instcombine, because InstCombine only optionally requires DataLayoutPass. Differential Revision: http://reviews.llvm.org/D7510 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229265 91177308-0d34-0410-b5e6-96231b3b80d8
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