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[ARM][ParallelDSP] Change the search for smlads
Two functional changes have been made here: - Now search up from any add instruction to find the chains of operations that we may turn into a smlad. This allows the generation of a smlad which doesn't accumulate into a phi. - The search function has been corrected to stop it falsely searching up through an invalid path. The bulk of the changes have been making the Reduction struct a class and making it more C++y with getters and setters. Differential Revision: https://reviews.llvm.org/D61780 llvm-svn: 365740
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