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Eli Friedman
fad8f14d9d
[ARM] Prefer lsls+lsrs over lsls+ands or lsrs+ands in Thumb1.
Saves materializing the immediate for the "ands". Corresponding patterns exist for lsrs+lsls, but that seems less common in practice. Now implemented as a DAGCombine. Differential Revision: https://reviews.llvm.org/D49585 llvm-svn: 337945
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