[PATCH] [Polly] Support ModRef function behaviour

[Johannes Doerfert]

>>! In D5227#7, @dpeixott wrote:
> As far as I know detailed mod-ref-behaviour is currently only returned in the case of intrinsic functions. These functions are defined with the appropriate values and tablegen generates some code to return the correct values. You could use an intrinsic function in your test (e.g. llvm.prefetch).

Unfortunatly I cannot export the "onlyReadsArgumentPointees" of llvm.prefetch to IR... it gets overaproximated to "onlyReadsMemory" for now.

http://reviews.llvm.org/D5227