[PATCH] Fix SROA regression causing data corruption, fixes PR19250

[Björn Steinbrink]

Added a comment to explain why the whole if-else block has to be moved after
the early continue. Moved the original test into its own file and added new
tests for the slice order indepence of the chosen type for the alloca.

http://reviews.llvm.org/D3297

Files:
  lib/Transforms/Scalar/SROA.cpp
  test/Transforms/SROA/basictest.ll
  test/Transforms/SROA/order_independence.ll
  test/Transforms/SROA/slicewidth.ll
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