Dinesh Dwivedi b62e52e1b5 Refactored and updated SimplifyUsingDistributiveLaws() to ...

* Find factorization opportunities using identity values.
 * Find factorization opportunities by treating shl(X, C) as mul (X, shl(C))
 * Keep NSW flag while simplifying instruction using factorization.

This fixes PR19263.

Differential Revision: http://reviews.llvm.org/D3799

llvm-svn: 211261

2014-06-19 08:29:18 +00:00

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