[PATCH] Fixup PHI nodes in LowerSwitch

[Marcello Maggioni]

Updated to implement Philip suggestion of looping over all the edges
Added more context to checks in the PHILowering test + moved the checks in function context instead of global
Reverted the to the getFirstNonPHI() version waiting for more input on the matter

http://reviews.llvm.org/D4298

Files:
  lib/Transforms/Utils/LowerSwitch.cpp
  test/Transforms/LowerSwitch/2014-06-23-PHIlowering.ll
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