[PATCH] [Polly] We do not support alias checks for basepointers defined inside the SCoP

[Tobias Grosser]

Hi jdoerfert,

The run-time alias check places code that involves the base pointer at the
beginning of the SCoP. This breaks if the base pointer is defined inside the
scop. Hence, we can only use it if we are sure the base pointer is not an
instruction defined inside the scop.  Otherwise we refuse to handle the SCoP.

This commit should unbreak some of our current LNT failures.

http://reviews.llvm.org/D5483

Files:
  lib/Analysis/ScopDetection.cpp
  test/ScopDetect/run_time_alias_check.ll
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