[PATCH] Use function attribute "arm-restrict-it"

[Eric Christopher]

Hi Renato,

We've always had two options for this sort of thing, just much more
horribly implemented. :)

Basically the backend developers want to be able to override (largely for
debugging purposes) the "default" for whether or not to construct IT
blocks. It's just overriding the source level and it's good that we can do
this without having developers overwrite the source themselves (it could be
quite large).

I've delayed on reviewing this patch because I'm not quite sure how I want
particular target options to be passed to the backend, but in general the
idea of the patch ("allow the backend to override the IR") isn't a bad
thing.

-eric


http://reviews.llvm.org/D10416

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