rnk added a comment.

In http://reviews.llvm.org/D21141#452517, @aprantl wrote:

> Assuming that we could usually get the calling convention from the Function — 
> what's the motivation for emitting the calling convention of a subprogram 
> that has been optimized away?


I don't have any motivation to emit DISubprograms for optimized away code, but 
Functions aren't always available. Function pointers can also have calling 
conventions, and they will only have a DISubroutineType.


http://reviews.llvm.org/D21141



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