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The distinction between the LLVMTargetMachine and TargetMachine classes has become somewhat muddy recently. So I created: https://reviews.llvm.org/D38482 to clean things up. During review it was noted that we may rather merge the two instead which looks like this: https://reviews.llvm.org/D38489 <https://reviews.llvm.org/D38489> We really should choose one of the two over the status quo.