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

[Dinesh Dwivedi]

Closed by commit rL211261 (authored by dinesh).

http://reviews.llvm.org/D3799

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