[PATCH] Fix aliasing issue caused by MemCpyOptimizer (PR18304)

[David Wiberg]

Hello,

The attached patch fixes an aliasing issue caused by MemCpyOptimizer
by performing the following changes:
- Added requirement that the callee does not capture the src pointer for
  the transformation to apply.
- Updated test cases by adding nocapture attributes where applicable

See http://lists.cs.uiuc.edu/pipermail/llvmdev/2014-June/073819.html
for some more information. My main concern is performance regressions
but I haven't been able to get any benchmark results.

Best regards
David
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