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CodeGen_LLVM.cpp: opaque pointers are now standard, and that flag no longer works anyway.
Var.h: We convert strings to Vars in many places internally, and some of those Vars originated from implicit Vars, so it's not feasible to require than the version that takes an explicit string isn't allowed to be passed things of the form "_[0-9]*". You can use the explicit constructor to make collisions with other Vars, and yes this includes the implicit vars.