[PATCH] Fixing inst-combine not to drops nsw when combining adds into mul (PR19263)

[Dinesh Dwivedi]

Thanks for review. I have updated cast<BinaryOperator>(SimplifiedInst) to use dyn_cast.

http://reviews.llvm.org/D3799

Files:
  lib/Transforms/InstCombine/InstCombineAddSub.cpp
  lib/Transforms/InstCombine/InstructionCombining.cpp
  test/Transforms/InstCombine/add2.ll
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