[PATCH] SROA: Don't insert instructions before a PHI

[David Majnemer]

Hi chandlerc,

SROA may decide that it needs to insert a bitcast and would set it's
insertion point before a PHI.  This will create an invalid module
right quick.

Instead, choose the first insertion point in the basic block that holds
our PHI.

The only testcase that I've got relies on a very specific uselist, I
haven't managed to come up with something nice and simple.

http://reviews.llvm.org/D5141

Files:
  lib/Transforms/Scalar/SROA.cpp
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